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- .*
- .* GBMV2.SCR - Help for GbmV2
- .*
- .* Important: Only edit the original .SCR file.
- .* If this file is not by the filename given above, then it has been put
- .* through IPFCPREP and so will be regenerated next MAKE.
- .*
- .imd gbmdlgrc.h
- .*...vgbmdlgrc\46\h:0:
- .imd gbmv2hlp.h
- .*...vgbmv2hlp\46\h:0:
- :userdoc.
- .*...sprolog:0:
- :prolog.
- :title.GbmV2 Help
- :author.Andy Key
- :eprolog.
- .*...e
- :toc.
- :body.
- .*...sHID_INTRO \45\ Introduction to GbmV2:0:
- :h1 res=&HID_INTRO..Introduction to GbmV2
- :i1.Introduction to GbmV2
- :p.This is a simple bitmap viewer.
- :p.Bitmap files in various formats may be loaded into memory.
- This is the :hp2.actual bitmap data:ehp2..
- :p.The program displays a view of the bitmap in its window.
- This is called the :hp2.view bitmap:ehp2..
- The choice of how the view is made from the actual data may be changed
- from the
- :link reftype=hd res=&HID_VIEW..View menu:elink..
- :p.If the bitmap is smaller than the window, it is displayed centralised
- within the window.
- :p.If the bitmap is larger than the window, then scrollbars may be used to
- pick the visible part of the bitmap.
- :p.Once a bitmap is loaded, it may be printed to the default PM printer.
- :p.All, or a part of, the current bitmap can be selected, and then copied
- to the clipboard.
- :p.1bpp bitmaps are typically tricky to handle under OS/2 PM.
- :p.This program will display a 1bpp bitmap using the 2 colours in the
- bitmap files header, rather than the users current PM colour scheme.
- :p.While files are loading, saving, printing etc., this program prevents you
- from using its other functions.
- :p.From the menu bar you can use&colon.
- :dl compact tsize=7 break=all.
- :dt.:link reftype=hd res=&HID_FILE..File:elink.
- :dd.To transfer the text to and from disk
- :dt.:link reftype=hd res=&HID_EDIT..Edit:elink.
- :dd.To transfer some or all of the bitmap to the OS/2 clipboard
- :dt.:link reftype=hd res=&HID_BITMAP..Bitmap:elink.
- :dd.To perform simple operations on the bitmap
- :dt.:link reftype=hd res=&HID_VIEW..View:elink.
- :dd.To select how you see the current bitmap
- :dt.Help
- :dd.To display various types of help for using this utility.
- :edl.
- :p.You can display online help for GbmV2 by using the following methods.
- :ul compact.
- :li.For help about any pull-down option, highlight it and press F1.
- :li.For help about any displayed dialog box, select the Help pushbutton.
- :li.To see the Help Index, use the Help pull-down, or press F11.
- :li.To see the Help table of contents, display a help panel and use the
- Help Options pull-down (or press Ctrl+C).
- :eul.
- .*...e
- .*...sHID_FILE \45\ File menu:0:
- :h1 res=&HID_FILE..File menu
- :i1 id=file.File menu
- :p.The File menu allows you to load a new bitmap, to save to a bitmap file,
- and to print.
- You can use&colon.
- :dl tsize=7 break=all.
- :dt.:link reftype=hd res=&HID_NEW..New:elink.
- :dd.To clear out the current bitmap.
- :dt.:link reftype=hd res=&HID_OPEN..Open:elink.
- :dd.To discard the current bitmap and read a new file from disk.
- The file to load is selected via the
- :link reftype=hd res=&HID_GBM_FILEDLG..Bitmap File dialog:elink..
- :dt.:link reftype=hd res=&HID_SAVE..Save:elink.
- :dd.To save the current bitmap to a file, under the current filename.
- The actual bitmap data, rather than the view what you see of it that is saved.
- :dt.:link reftype=hd res=&HID_SAVE_AS..Save as:elink.
- :dd.To save the current bitmap to a file with a filename you specify.
- The filename to save to is specified via the
- :link reftype=hd res=&HID_GBM_FILEDLG..Bitmap File dialog:elink..
- The actual bitmap data, rather than the view what you see of it that is saved.
- :edl.
- .*...e
- .*...sHID_NEW \45\ New:0:
- :h2 res=&HID_NEW..New
- :i2 refid=file.New
- :p.Will clear any loaded bitmap from memory.
- :p.
- You can also begin a :hp2.New:ehp2. file by pressing
- :hp2.Ctrl+N:ehp2..
- .*...e
- .*...sHID_OPEN \45\ Open:0:
- :h2 res=&HID_OPEN..Open
- :i2 refid=file.Open
- :p.Brings up a dialog box which allows you to specify the bitmap file to
- load.
- The file to load to is specified via the
- :link reftype=hd res=&HID_GBM_FILEDLG..Bitmap File dialog:elink..
- :p.You can also :hp2.Open:ehp2. a file by pressing
- :hp2.Ctrl+O:ehp2..
- .*...e
- .*...sHID_SAVE \45\ Save:0:
- :h2 res=&HID_SAVE..Save
- :i2 refid=file.Save
- :p.Saves the currently loaded bitmap.
- :p.It is the actual bitmap data, not the view you see, that is actually
- saved. For example, the actual bitmap map can be 24 bit, but you may be looking
- at an (8 bit) error diffused version on the screen.
- :p.If you wish to save under a new filename, use
- :link reftype=hd res=&HID_SAVE_AS..Save as:elink. instead.
- :p.You can also :hp2.Save:ehp2. to a file by pressing
- :hp2.Ctrl+S:ehp2..
- .*...e
- .*...sHID_SAVE_AS \45\ Save As:0:
- :h2 res=&HID_SAVE_AS..Save As
- :i2 refid=file.Save As
- :p.Saves the currently loaded bitmap, but under a new filename.
- The filename to save to is specified via the
- :link reftype=hd res=&HID_GBM_FILEDLG..Bitmap File dialog:elink..
- :p.If you wish to save under the current name, use
- :link reftype=hd res=&HID_SAVE..Save:elink. instead.
- :p.It is the actual bitmap data, not the view you see, that is actually
- saved. For example, the actual bitmap can map be 24 bit, but you may be looking
- at an (8 bit) error diffused version on the screen.
- :p.You can also :hp2.Save as:ehp2. to a named file by pressing
- :hp2.Ctrl+A:ehp2..
- .*...e
- .*...sHID_PRINT \45\ Print:0:
- :h2 res=&HID_PRINT..Print
- :i2 refid=file.Print
- :p.Prints the currently loaded bitmap to the default PM printer.
- :p.It is the screen view of the bitmap, not the actual bitmap data itself,
- that is transferred to the printer.
- :p.Works best when the default PM printer is a PostScript printer, as they
- typically can simulate 26 gray-scale levels via halftoning.
- :p.
- You can also :hp2.Print:ehp2. by pressing :hp2.Ctrl+P:ehp2..
- .*...e
- .*...sHID_EDIT \45\ Edit menu:0:
- :h1 res=&HID_EDIT..Edit menu
- :i1 id=edit.Edit menu
- :p.The Edit menu allows you to select a sub-rectangle of the bitmap and then
- copy it to the clipboard.
- :p.
- You can use&colon.
- :dl tsize=7 break=all.
- :dt.:link reftype=hd res=&HID_UNDO..Undo:elink.
- :dd.To undo the last operation performed on the bitmap.
- :dt.:link reftype=hd res=&HID_SELECT..Select:elink.
- :dd.To select a part of the current bitmap.
- :dt.:link reftype=hd res=&HID_SELECT_ALL..Select all:elink.
- :dd.To select all the current bitmap.
- :dt.:link reftype=hd res=&HID_DESELECT..Deselect:elink.
- :dd.To cancel the current selection.
- :dt.:link reftype=hd res=&HID_COPY..Copy:elink.
- :dd.This copies the current selection to the clipboard.
- :edl.
- .*...e
- .*...sHID_UNDO \45\ Undo:0:
- :h2 res=&HID_UNDO..Undo
- :i2 refid=edit.Undo
- :p.The Undo operation undoes the last change to the bitmap.
- :p.It is only selectable after a change has been done to the bitmap,
- such as those provided under the
- :link reftype=hd res=&HID_BITMAP..Bitmap menu:elink..
- :p.In low memory situations, it may be impossible to undo a
- previous operation.
- :p.Certain operations, such as
- :link reftype=hd res=&HID_NEW..New:elink.
- and
- :link reftype=hd res=&HID_OPEN..Open:elink.
- are not undoable.
- .*...e
- .*...sHID_SELECT \45\ Select:0:
- :h2 res=&HID_SELECT..Select
- :i2 refid=edit.Select
- :p.After choosing this menu selection, the mouse pointer changes into a
- angle-bracket-L shape which you move to the bottom left of the region of the
- bitmap you wish to select, and then press the left mouse button.
- Then it changes to an angle-bracket-7 shape, which you then move to the top
- right of the region you wish to select, and then press the left mouse button.
- :p.This newly selected region becomes selected and is marked with a
- rectangle.
- :p.This is the region that can subsequently become copied to the clipboard
- using
- :link reftype=hd res=&HID_COPY..Copy:elink..
- :p.Alternatively, the whole bitmap can be selected using
- :link reftype=hd res=&HID_SELECT_ALL..Select all:elink..
- :p.The Esc key cancels the selection process.
- .*...e
- .*...sHID_SELECT_ALL \45\ Select all:0:
- :h2 res=&HID_SELECT_ALL..Select all
- :i2 refid=edit.Select all
- :p.After choosing this menu selection, the whole current bitmap is selected.
- :p.This newly selected region becomes selected and is marked with a
- a rectangle.
- :p.This is the region that can subsequently become copied to the clipboard
- using
- :link reftype=hd res=&HID_COPY..Copy:elink..
- :p.Alternatively, just a part of the bitmap can be selected using
- :link reftype=hd res=&HID_SELECT..Select:elink..
- :p.You can also :hp2.Select all:ehp2. by pressing :hp2.Ctrl+/:ehp2..
- .*...e
- .*...sHID_DESELECT \45\ Deselect:0:
- :h2 res=&HID_DESELECT..Deselect
- :i2 refid=edit.Deselect
- :p.This menu item removes the current selection.
- :p.
- You can also :hp2.Deselect:ehp2. by pressing :hp2.Esc:ehp2., or
- by clicking the right mouse button on the bitmap.
- .*...e
- .*...sHID_COPY \45\ Copy:0:
- :h2 res=&HID_COPY..Copy
- :i2 refid=edit.Copy
- :p.This can only occur if there is a selected region.
- :p.This menu item copies the current selected region to the clipboard.
- :p.A region can be selected using
- :link reftype=hd res=&HID_SELECT..Select:elink. or
- :link reftype=hd res=&HID_SELECT_ALL..Select all:elink..
- :p.It is the version you see on the screen that is copied to the clipboard,
- not the actual original bitmap data itself.
- :p.You can also :hp2.Copy:ehp2. by pressing
- :hp2.Ctrl+Ins:ehp2..
- .*...e
- .*...sHID_BITMAP \45\ Bitmap menu:0:
- :h1 res=&HID_BITMAP..Bitmap menu
- :i1 id=bmp.Bitmap menu
- :p.The Bitmap menu allows you to perform simple operations on the
- current bitmap.
- :p.You can use&colon.
- :dl tsize=7 break=all.
- :dt.:link reftype=hd res=&HID_REF_HORZ..Reflect horizontally:elink.
- :dd.To reflect the bitmap left-to-right.
- :dt.:link reftype=hd res=&HID_REF_VERT..Reflect vertically:elink.
- :dd.To reflect the bitmap left-to-right.
- :dt.:link reftype=hd res=&HID_ROT_90..Rotate 90 degrees:elink.
- :dd.To rotate the bitmap 90 degrees anticlockwise.
- :dt.:link reftype=hd res=&HID_ROT_180..Rotate 180 degrees:elink.
- :dd.To rotate the bitmap 180 degrees.
- :dt.:link reftype=hd res=&HID_ROT_270..Rotate 270 degrees:elink.
- :dd.To rotate the bitmap 90 degrees clockwise.
- :dt.:link reftype=hd res=&HID_TRANSPOSE..Transpose x for y:elink.
- :dd.To transpose the bitmap x for y.
- :dt.:link reftype=hd res=&HID_CROP..Crop to selection:elink.
- :dd.To discard all but the selected part of the bitmap.
- :dt.:link reftype=hd res=&HID_COLOUR..Colour space...:elink.
- :dd.To map bitmap pixels / palettes between colour spaces.
- :dt.:link reftype=hd res=&HID_MAP..Map...:elink.
- :dd.To map between various numbers of bits per pixel and between
- various palettes.
- :edl.
- :p.The
- :link reftype=hd res=&HID_UNDO..Undo:elink.
- menuitem can be used to undo the last operation performed on
- a bitmap.
- .*...e
- .*...sHID_REF_HORZ \45\ Reflect horizontally:0:
- :h2 res=&HID_REF_HORZ..Reflect horizontally
- :i2 refid=bmp.Reflect horizontally
- :p.This reflects the whole bitmap left-to-right.
- :p.Reflecting vertically can be done using the similar
- :link reftype=hd res=&HID_REF_VERT..Reflect vertically:elink.
- selection.
- :p.Other operations on the bitmap can be accessed from the
- :link reftype=hd res=&HID_BITMAP..Bitmap menu:elink..
- .*...e
- .*...sHID_REF_VERT \45\ Reflect vertically:0:
- :h2 res=&HID_REF_VERT..Reflect vertically
- :i2 refid=bmp.Reflect vertically
- :p.This reflects the whole bitmap top-to-bottom.
- :p.Reflecting horizontally can be done using the similar
- :link reftype=hd res=&HID_REF_HORZ..Reflect horizontally:elink.
- selection.
- :p.Other operations on the bitmap can be accessed from the
- :link reftype=hd res=&HID_BITMAP..Bitmap menu:elink..
- .*...e
- .*...sHID_ROT_90 \45\ Rotate 90 degrees:0:
- :h2 res=&HID_ROT_90..Rotate 90 degrees
- :i2 refid=bmp.Rotate 90 degrees
- :p.This rotates the bitmap through 90 degrees clockwise.
- :p.Other rotations may be acheived via the
- :link reftype=hd res=&HID_ROT_180..Rotate 180 degrees:elink. and
- :link reftype=hd res=&HID_ROT_270..Rotate 270 degrees:elink. commands.
- :p.Other operations on the bitmap can be accessed from the
- :link reftype=hd res=&HID_BITMAP..Bitmap menu:elink..
- .*...e
- .*...sHID_ROT_180 \45\ Rotate 180 degrees:0:
- :h2 res=&HID_ROT_180..Rotate 180 degrees
- :i2 refid=bmp.Rotate 180 degrees
- :p.This rotates the bitmap through 180 degrees clockwise.
- :p.Other rotations may be acheived via the
- :link reftype=hd res=&HID_ROT_90..Rotate 90 degrees:elink. and
- :link reftype=hd res=&HID_ROT_270..Rotate 270 degrees:elink. commands.
- :p.Other operations on the bitmap can be accessed from the
- :link reftype=hd res=&HID_BITMAP..Bitmap menu:elink..
- .*...e
- .*...sHID_ROT_270 \45\ Rotate 270 degrees:0:
- :h2 res=&HID_ROT_270..Rotate 270 degrees
- :i2 refid=bmp.Rotate 270 degrees
- :p.This rotates the bitmap through 270 degrees clockwise.
- :p.Other rotations may be acheived via the
- :link reftype=hd res=&HID_ROT_90..Rotate 90 degrees:elink. and
- :link reftype=hd res=&HID_ROT_180..Rotate 180 degrees:elink. commands.
- :p.Other operations on the bitmap can be accessed from the
- :link reftype=hd res=&HID_BITMAP..Bitmap menu:elink..
- .*...e
- .*...sHID_TRANSPOSE \45\ Transpose x for y:0:
- :h2 res=&HID_TRANSPOSE..Transpose x for y
- :i2 refid=bmp.Transpose x for y
- :p.This reflects the bitmap through the line y=x.
- :p.Other operations on the bitmap can be accessed from the
- :link reftype=hd res=&HID_BITMAP..Bitmap menu:elink..
- .*...e
- .*...sHID_CROP \45\ Crop to selection:0:
- :h2 res=&HID_CROP..Crop to selection
- :i2 refid=bmp.Crop to selection
- :p.This discards all the bitmap except the selected bit.
- :p.Other operations on the bitmap can be accessed from the
- :link reftype=hd res=&HID_BITMAP..Bitmap menu:elink..
- .*...e
- .*...sHID_COLOUR \45\ Colour space\46\\46\\46\:0:
- :h2 res=&HID_COLOUR..Colour space...
- :i2 refid=bmp.Colour space...
- :p.This menuitem will cause the
- :link reftype=hd res=&HID_COLOUR_DLG..Colour space dialog:elink.
- to appear.
- From here mappings between :hp2.intensity:ehp2., :hp2.L* cyclometric:ehp2.
- and :hp2.gamma corrected:ehp2. colour spaces may be performed.
- :p.Other operations on the bitmap can be accessed from the
- :link reftype=hd res=&HID_BITMAP..Bitmap menu:elink..
- .*...e
- .*...sHID_MAP \45\ Map\46\\46\\46\:0:
- :h2 res=&HID_MAP..Map...
- :i2 refid=bmp.Map...
- :p.This menuitem will cause the
- :link reftype=hd res=&HID_MAP_DLG..Map dialog:elink.
- to appear.
- From here mappings between various numbers of bits per pixel and
- various palettes may be performed.
- :p.Other operations on the bitmap can be accessed from the
- :link reftype=hd res=&HID_BITMAP..Bitmap menu:elink..
- .*...e
- .*...sHID_VIEW \45\ View menu:0:
- :h1 res=&HID_VIEW..View menu
- :i1 id=view.View menu
- :p.The View menu allows you to choose what representation (or view) of the
- bitmap you have loaded will be used for display on the screen.
- :p.
- You can use&colon.
- :dl tsize=7 break=all.
- :dt.:link reftype=hd res=&HID_VIEW_NULL..Raw PM mapping:elink.
- :dd.To tell this program to perform no image enhancment for display
- purposes. The view bitmap is displayed as good as PM will, with no improvement.
- :dt.:link reftype=hd res=&HID_VIEW_HALFTONE..Halftoned:elink.
- :dd.To tell this program to show a halftoned version of the bitmap to the
- user, rather than the actual bitmap data itself.
- This generally looks slightly better and is quick to do.
- :dt.:link reftype=hd res=&HID_VIEW_ERRDIFF..Error diffused:elink.
- :dd.To tell this program to show a error-diffused version of the bitmap to the
- user, rather than the actual bitmap data itself.
- This generally looks much better, but takes longer to do.
- :edl.
- :p.This program makes a guess at the type of display adaptor you are using
- and chooses the most appropriate form of halftoning or error-diffusion to
- use.
- Specifically, it has algorithms known to work well on &colon.-
- :sl.
- :li.16 colour VGA
- :li.256 colour 8514/A, XGA and Image Adaptor/A.
- :li.65536 direct colour XGA-2.
- :esl.
- :p.If you actually wish to change the bitmap data itself, then you can use the
- :link reftype=hd res=&HID_MAP_DLG..Map dialog:elink. to do this.
- .*...e
- .*...sHID_VIEW_NULL \45\ Raw PM mapping:0:
- :h2 res=&HID_VIEW_NULL..Raw PM mapping
- :i2 refid=view.Raw PM mapping
- :p.This tells this program to not perform any image enhancement that will make
- a bitmap look closer to its true colours and shades on the screen.
- :p.You can also select view :hp2.Raw PM mapping:ehp2. by pressing
- :hp2.Ctrl+R:ehp2..
- :p.It is possible to select other views from the
- :link reftype=hd res=&HID_VIEW..View menu:elink..
- .*...e
- .*...sHID_VIEW_HALFTONE \45\ Halftoned:0:
- :h2 res=&HID_VIEW_HALFTONE..Halftoned
- :i2 refid=view.Halftoned
- :p.This tells this program that it should present a halftoned view
- of the current bitmap to the user.
- :p.The actual bitmap data itself is not affected, only what you see on the
- screen.
- :p.Hence if
- :link reftype=hd res=&HID_SAVE..Save:elink. or
- :link reftype=hd res=&HID_SAVE_AS..Save as:elink.
- are used, the unchanged actual bitmap data is saved.
- :p.Halftoning is generally quicker than error diffusion.
- :p.You can also select view :hp2.Halftoned:ehp2. by pressing
- :hp2.Ctrl+H:ehp2..
- :p.It is possible to select other views from the
- :link reftype=hd res=&HID_VIEW..View menu:elink..
- .*...e
- .*...sHID_VIEW_ERRDIFF \45\ Error diffused:0:
- :h2 res=&HID_VIEW_ERRDIFF..Error diffused
- :i2 refid=view.Error diffused
- :p.This tells this program that it should present an error-diffused picture
- of the current bitmap to the user.
- :p.The actual bitmap data itself is not affected, only what you see on the
- screen.
- :p.Hence if
- :link reftype=hd res=&HID_SAVE..Save:elink. or
- :link reftype=hd res=&HID_SAVE_AS..Save as:elink.
- are used, the unchanged actual bitmap data is saved.
- :p.Error diffusion takes longer than halftoning, but the quality is
- generally higher, especially on continuous tone images.
- :p.You can also select view :hp2.Error diffused:ehp2. by pressing
- :hp2.Ctrl+E:ehp2..
- :p.It is possible to select other views from the
- :link reftype=hd res=&HID_VIEW..View menu:elink..
- .*...e
- .*...sHID_HELP \45\ Help menu:0:
- :h1 res=&HID_HELP..Help menu
- :i1 id=help.Help menu
- :p.Use this menu to bring up the help system.
- .*...e
- .*...sHID_HELP_FOR_HELP \45\ Help for help:0:
- :h2 res=&HID_HELP_FOR_HELP..Help for help
- :i2 refid=help.Help for help
- :p.Use this choice to bring up the help for the help system.
- .*...e
- .*...sHID_HELPEXTENDED \45\ Extended Help:0:
- :h2 res=&HID_HELPEXTENDED..Extended Help
- :i2 refid=help.Extended Help
- :p.Use this choice to bring up general help for GbmV2.
- .*...e
- .*...sHID_HELPKEYS \45\ Keys help:0:
- :h2 res=&HID_HELPKEYS..Keys help
- :i2 refid=help. Keys Help
- :p.The following keys may be used in the main window &colon.-
- :ul.
- :li.:hp2.Ctrl+N:ehp2. selects
- :link reftype=hd res=&HID_NEW..New:elink. which clears the bitmap.
- :li.:hp2.Ctrl+O:ehp2. to
- :link reftype=hd res=&HID_OPEN..Open:elink. a new bitmap file via the
- :link reftype=hd res=&HID_GBM_FILEDLG..Bitmap File dialog:elink..
- :li.:hp2.Ctrl+S:ehp2. to
- :link reftype=hd res=&HID_SAVE..Save:elink. the current bitmap.
- :li.:hp2.Ctrl+A:ehp2. selects
- :link reftype=hd res=&HID_SAVE_AS..Save as:elink. which saves the bitmap
- under a new filename, specified via the
- :link reftype=hd res=&HID_GBM_FILEDLG..Bitmap File dialog:elink..
- :li.:hp2.Ctrl+P:ehp2. to
- :link reftype=hd res=&HID_PRINT..Print:elink. the current bitmap.
- :li.:hp2.Ctrl+R:ehp2. to select
- :link reftype=hd res=&HID_VIEW_NULL..Raw PM mapping:elink. view mode.
- :li.:hp2.Ctrl+H:ehp2. to select
- :link reftype=hd res=&HID_VIEW_HALFTONE..Halftoned:elink. view mode.
- :li.:hp2.Ctrl+E:ehp2. to select
- :link reftype=hd res=&HID_VIEW_ERRDIFF..Error diffused:elink. view mode.
- :li.:hp2.Ctrl+/:ehp2. to
- :link reftype=hd res=&HID_SELECT_ALL..Select all:elink. all of
- the current bitmap.
- :li.:hp2.Ctrl+\:ehp2. to
- :link reftype=hd res=&HID_DESELECT..Deselect:elink. any current selection.
- :li.:hp2.Esc:ehp2. to
- :link reftype=hd res=&HID_DESELECT..Deselect:elink. any current selection.
- :li.:hp2.Ctrl+Ins:ehp2. to
- :link reftype=hd res=&HID_COPY..Copy:elink. the current selection
- to the clipboard.
- :li.The :hp2.Arrow:ehp2. keys may be used to scroll around the bitmap.
- Note that :hp2.Shift+Arrows:ehp2. behave like page up/down/left or right.
- :li.:hp2.F3:ehp2. to close GbmV2.
- :eul.
- .*...e
- .*...sHID_HELPINDEX \45\ Help index:0:
- :h2 res=&HID_HELPINDEX..Help index
- :i2 refid=help.Help index
- :p.Use this to bring up an index of the help.
- .*...e
- .*...sHID_COLOUR_DLG \45\ Colour space dialog:0:
- :h1 res=&HID_COLOUR_DLG..Colour space dialog
- :i1 id=cspace.Colour space dialog
- :p.If a light is physically twice as bright, the eye does not
- necessarily see it as twice as bright. Also, if a pixel is
- written onto a monitor screen with twice the value, the physical
- intensity of the pixel is not necessarily double.
- :p.How exactly should numbers inside a bitmap file relate to
- physical or perceived intensitys when displayed on the screen?
- :p.In OS/2 PM perceived intensitys are proportional to the values
- in the bitmap file.
- Pixels in such a bitmap are in the :hp2.L* cyclometric:ehp2. colour space.
- This is done to ensure that an even scale of pixel values gives an even
- scale of brightness, when viewed by the human eye.
- :p.Ray Tracers often write pixel values in the bitmap proportional to
- the physical intensity computed for that ray.
- Also this may be more suitable if certain image processing/enhancement
- techniques are to be applied to the image data.
- Such data is in the :hp2.intensity:ehp2. colour space.
- :p.Finally, if a bitmap holds values computed in such a way as to
- compensate for the gamma of the monitor (ie: intensitys transformed
- to cancel out the gamma of the monitor), then the data is in
- a :hp2.gamma corrected:ehp2. colour space.
- Bitmap data that has come directly from a greyscale or colour scanner may
- also be in a gamma corrected colour space.
- :p.Of course, despite OS/2 PM using the L* cyclometric colour space, this
- machine is attached to a monitor with specific characteristics and your eyes
- also have their own characteristics.
- But it is the responsibility of OS/2 PM screen drivers to perform the mapping
- from the L* cyclometric colour space to suitable palette entrys which take
- into account both the gamma (and shelf) of the monitor in use, and the
- visual characteristics of the human eye.
- This is done transparently to PM applications.
- :p.The various :hp2.mappings:ehp2. allow you map between any 2 of these
- 3 colour spaces. Examples of typical usage follow &colon.-
- :dl tsize=7 break=all.
- :dt.Intensity to L* cyclometric
- :dd.You have loaded a bitmap file where the pixel values are proportional
- to the physical intensity.
- Such bitmaps often tend to look too dark under OS/2 PM.
- This will map the pixels to the L* cyclometric colour space, giving a better
- rendition under OS/2 PM.
- :dt.Intensity to gamma corrected
- :dd.The resulting bitmap, may still look too dark/light under OS/2 PM, but
- when saved, and displayed on a monitor with the relevant
- :hp2.gamma:ehp2. and :hp2.shelf:ehp2. with a program that directly controls
- the hardware, the correct rendition will result.
- :dt.L* cyclometric to Intensity
- :dd.You have a regular OS/2 PM bitmap, and wish to make the pixel values in
- the file directly proportional to the physical intensity.
- You might do this to generate a bitmap suitable for feeding into a
- Ray Tracer as a 2D texture map.
- :dt.L* cyclometric to gamma corrected
- :dd.As above, but generating bitmap bits suitable for directly placing in
- hardware registers.
- :dt.Gamma corrected to Intensity
- :dd.You have loaded a bitmap that has come directly from some scanner
- hardware, and wish to make bitmap where bits are proportional to intensity.
- :dt.Gamma corrected to L* cyclometric
- :dd.You have loaded a bitmap from a scanner, and wish to make a bitmap
- best suited for OS/2 PM.
- :edl.
- :p.When mapping to or from the gamma corrected colour space, the
- :hp2.gamma:ehp2. and :hp2.shelf:ehp2. values are significant.
- When the gamma corrected colour space is not involved, the gamma and
- shelf parameters are greyed.
- For example, the gamma of the 8514 monitor is about 2.1.
- :p.The shelf parameter will normally be left 0.0, but has significance for
- some monitors.
- For example, on some 8514 monitors, if a greyscale of bitmap pixels 0 to 255
- is displayed, the first 35 values come out equally black. So, here a shelf
- of 0.136 (as 0.136*255=35) should be used.
- :p.Mapping of this sort should really be done on 24 bit data, before
- error-diffusion or halftoning takes place.
- :p.If the current bitmap is 24 bpp, then each bitmap pixel is mapped.
- Otherwise, the palette entrys are mapped.
- :p.This dialog is brought up from the
- :link reftype=hd res=&HID_COLOUR..Colour space...:elink. menuitem.
- .*...e
- .*...sHID_MAP_DLG \45\ Map dialog:0:
- :h1 res=&HID_MAP_DLG..Map dialog
- :i1 id=map.Map dialog
- :p.When the :hp2.Convert:ehp2. pushbutton is pressed on this dialog,
- the current bitmap is expanded from however many bits per pixel it
- currently is to 24 bits per pixel (with no palette).
- :p.Then a mapping is performed, to the desired number of bits per pixel
- and palette specified.
- :p.For some mappings, some or all of the values in the :hp2.Values:ehp2.
- part of the dialog box are used.
- Those which have no effect are greyed.
- :p.Also, when mapping to some palettes, the option of using
- :hp2.halftoning:ehp2. or :hp2.error diffusion:ehp2. may be available.
- When these are unavailable, they are greyed.
- :dl tsize=7 break=all.
- :dt.1bpp, black and white
- :dd.The bitmap is mapped to black and white.
- This is done by mapping each pixel to a grey value, and then seeing
- if the brightness is in the high 50% or not.
- :dt.4bpp, 8 colours
- :dd.This maps each pixel to one of black, white, red, green, blue, cyan,
- magenta or yellow.
- This option is handy for generating bitmaps to be fed into colour printers.
- :dt.4bpp, 16 colour VGA palette
- :dd.Each pixel is mapped to a colour in the VGA palette used by DOS, Windows
- and OS/2 PM.
- :dt.4bpp, 16 shades of grey
- :dd.Each pixel is mapped to one of 16 shades of grey.
- :dt.8bpp, 7Rx8Gx4B palette (8514/A)
- :dd.This is a palette consisting of 7 levels of red, 8 levels of green and
- 4 levels of blue.
- It is constructed this way because the eye is most sensitive to green, then
- to red, and least to blue.
- Many OS/2 PM drivers (such as 16 bit 8514/A driver) use a palette with these
- colours in.
- Future OS/2 PM drivers (such as 32 bit drivers) should also use it to.
- :dt.8bpp, 6Rx6Gx6B palette (old XGA)
- :dd.An exception to the above is that the old 16 bit XGA-1 OS/2 PM driver
- used a 6 red by 6 green by 6 blue palette.
- The new 32 bit XGA-2 OS/2 PM driver uses the 7Rx8Gx4B palette.
- :dt.8bpp, 256 shades of grey
- :dd.Each pixel is mapped to a greyscale via a weighted sum of the red, green
- and blue components.
- Grey = 30% red + 59% green + 11% blue.
- These correspond to the eyes relative sensitivities to these primary colours.
- :dt.8bpp, 64R+64G+64B tri-pel palette
- :dd.The palette of the resulting bitmap has 64 shades of red, 64 of green
- and 64 of blue.
- Pixels in the source alternately have their red, green or blue component
- considered and a pixel written out from the relevant part of the palette.
- Therefore colour resolution is 6 bits of each of red, green and blue, at
- the expense of artifacts produced caused by the alternation and also at the
- expense of reducing the image brightness by a factor of 3.
- :dt.24 bpp, keep R bits red, G green, B blue
- :dd.Although the resulting image has 24bpp, only R bits of red, G of green
- and B of blue are non-zero.
- XGA-2 in its 16bpp mode has 65536 colours, which are composed from 32 levels
- of red, 64 of green and 32 of blue.
- Thus R=5, G=6, B=5 can be used to transform an image into what can be
- displayed on XGA-2.
- :dt.8bpp, as above, find N most used cols.
- :dd.After performing the above step, the 24bpp data is analysed to find the
- N most frequently occuring colours.
- Any pixels in the image in the N most used colours are mapped directly to
- that colour.
- Any pixel not in the N most used colours is mapped to the closest colour
- in the N most used.
- This may be used to make the best rendition for display by a DOS program
- that uses VGA 320x200 8bpp mode by setting R=6, G=6, B=6, N=256, since only
- 6 bits are significant in the VGA palette DACs, and we only have 256
- colours in the palette.
- :edl.
- :p.:hp9.Important:ehp9.
- :p.These mappings apply to the :hp2.actual bitmap data:ehp2. and are
- nothing to do with the viewing options available from the
- :link reftype=hd res=&HID_VIEW..View menu:elink..
- Therefore, if you load a bitmap, error diffuse via this dialog box,
- and then save, the saved file is error-diffused.
- This directly contrasts the View menu, where the error diffusion is
- purely for display purposes.
- :p.This dialog is brought up from the
- :link reftype=hd res=&HID_MAP..Map...:elink. menuitem.
- .*...e
- .*...sHID_CREDITS \45\ Credits:0:
- :h1 res=&HID_CREDITS..Credits
- :i1 id=credits.Credits
- :p.This code is the work of &colon.-
- :xmp.
-
- {{{ Andy Key
-
- Internet: ak@vnet.ibm.com
- IBM-VNET: AKEY AT HVTVM5
-
- :exmp.
- :p.Electronic addresses valid at least until 31st December 1993.
- .*...e
- :index.
- :euserdoc.
-