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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 4.iso
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bit
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cntl.hlp
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@c@C1@b@_ Control Panel
The control panel consists of several groups of buttons labeled by
their group names and functionality. Following is a brief summary of
what each group does. Detailed help is available inside each function.
@b External Bindings
This group controls the external bindings, configurable at run time,
to external programs (filters) or matrices (convolution).
The formats of the bindings can be found in the document, in the
sample binding files and also inside each function.
@f File Locations
The definition files should be named BIT_filters and BIT_convolve
respectively for external filters and convolutions matrices.
BIT will search the default system directory /usr/local/lib/bit,
or environment variable HELPDIR if one is defined, current directory,
and ~/.bitrc (or environment variable BITDIR) in that order.
All definitions found are concatenated with repeats removed.
@b Pan Buttons
The pan buttons pan an image as the arrows indicate. By default,
an image is displayed centered within the viewing window, i.e., the
image is chopped by equal amounts on all sides if the image size is
larger than the window size. The bottom most buttons control the pan
speed. In SlideShow mode, an image is panned automatically if its size
is larger than the window size (See AlwaysPan option in Setup.opt).
@b Image Types
This group provides conversions between the image types supported
by the bit program. Although type conversion typically is automatic
and transparent, this group is provided for unforeseen circumstances
where an explicit conversion is called for, e.g., some grayscale jpg
files have three color channels, and thus bit recognizes such files
as RGB files. Unless an explicit conversion to grayscale image is
performed, write module will also use three channels.
Note that for both convenience and performance, distinctions are made
for grayscale images stored in RGB format and colormapped format.
However, bi-level black and white image is available in colormap
format only.
Color reduction in a colormap is not implemented. To achieve this
goal, convert the image to RGB and convert to colormap again. The
number of colors in the map will be prompted for.
@b Misc. Control
This group controls functions that do not modify images but change
their appearances or facilitate the operation of other functions.
@f Zoom
Magnifies a region of an image to the window size with separately
adjustable x and y magnification factors.
@f HideF
Toggles on and off the File panel.
@f SysMap
Restore the default system map. Note a redraw event will
force the current image map, if exists, to be restored.
@f HideC
Hides the control panel.
@f Delete
Deletes current file from disk. Confirmation may be asked depending
on the configuration.
@b Edit Functions
The most important group of the program (the Beef). Many functions
are provided with capabilities for extensions. Most individual editing
functions have their own detailed help available on-line once you
enter that editing mode. Here is a summary of the currently available
editing functions:
@f Crop
Eliminates part of the image that is outside of the region of interest
defined by a rubber band.
@f Text
Renders arbitrary text of arbitrary color, size and orientation into
an image at arbitrary locations.
@f Cut&Paste:
Cuts a rectangular portion of an image and pastes it into another one.
@f SCP
A simplified Cut&Paste with all C&P limited to one image.
@f Scale
Scales an image with arbitrary x and y factors with optional
anti-aliasing.
@f Rotate:
Rotates an image by an arbitrary angle with optional anti-aliasing.
Mirror operation is also available.
@f PixTran:
Performs arbitrary color manipulations (1-to-1 transformation),
or change/swap pixel values.
@f Marking
Places simple geometric figures of arbitrary size and color into an
image. Could be used as a limited paint function.
@f MapEdit:
To edit the current colormap if one exists.
@f Sharpen:
Sharpens an image via a special convolution (Modified Laplacian).
@f PixelEdit:
To modify an individual pixel or a group of pixels
@f Smooth:
To Smooth the image via a special convolution (Neighbor Average).
@f Merge
To concatenate/merge several images to form a single image.
@f Enhance:
Enhances an image's contrast by histogram equalization.
@f Idiff
To show the difference between two identically sized images.
@f Edge
Performs edge detection by differentiation.
@f FFT:
Fourier Transform an image or a rectangular region of it.
Display the power spectra of an image.
@f Paint:
Pencil, spray and brush paint in full color
@b Getting More Info
The title bar of the edit control panel shows some vital info about
the currently displayed image by default. More info on current image
and bit program itself is available by clicking the mouse on the title
bar. Note that this button also serves as a trigger for format specific
functions, e.g., for b&w images, press this button will swap black
and white pixels.