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IMED256.ARJ
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1991-04-06
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IMED256
-------
By Nigel Salt (c) 1991
IMED256 is one of a family of products:
PCGRA (pcgdem.zip is the shareware version)
is a font/BitMap editor. It allows you to edit an image up
to 3x3 characters (24x48 pixels). It has a full range of
BitMap editing tools such as inversion, rotation,
mirroring, copying and moving blocks
You can save blocks of pixels in many ways one of which is
as a binary Microsoft image
16to256 converts 16 colour images saved by PCGRA into 256 colour
images as used by IMED256. This utility is available only
to registered users of PCGRA.
IMED256 is a tools for colouring Microsoft images including those
saved by PCGRA. If you do not use PCGRA you can still use
IMED256 but you lose out on the sophisticated BitMap
editing tools in PCGRA.
GETTING STARTED
---------------
Load up imed256 and you will find yourself at the main menu. To
the left is a 24x48 empty grid. Below the menu is an array of the
248 colours supported by the VGA adapter. Your cursor is flashing
in the colour box at the top left corner.
If you press an arrow key the cursor will move. Shifted arrow
keys move the cursor further. Ctrl and the Home, PgUP, End, and
PgDn keys takes you to a corner of the box.
Put the cursor on a colour that you like and press Tab.
You will now find a flashing cursor at the top left corner of the
grid to the left of the screen. Cursor controls are just the same
as they are in the colour box. Move around a bit if you like.
If you press SPACE,or INSERT, or ENTER the pixel under the cursor
will change to the colour selected in the colour box. If you look
at the box under the colour box you will see thet the pixel
corresponding to your grid position has now been plotted.
If you press + the colour under the cursor will be increased by
1. Nothing happens to the colour box cursor unless you press F3.
F3 moves the colour box cursor to the colour under your grid
cursor.
If you now press - the colour under your grid cursor will be
reduced by 1.
Plot a box of pixels. Move inside the box then press F2. Confirm
your coice and you will see that the box is filled. Filling can
be dangerous. If the area is not completely surrounded by the
current colour then the fill will escape and obliterate your
image.
Now Tab back to the colour box and select a new colour before
Tabbing back to the grid. Position your cursor on one of the
pixels in your box and press F1. You will see that all of the
pixels that were the colour under the cursor are now the current
colour.
If you now Tab back to the colour box you can save the image.
Press F2 and follow the prompts. Tab to the grid
Make a few changes then Tab back to the colour box. Now press F1
and follow the prompts to load the image that you saved.
That concludes the operation of IMED256 the remainder of tgis
document explains the usage of the images that you create.
FILE FORMATS
------------
Both PCGRA and IMED256 can save images in Microsoft C image
format but because the two programs operate in different video
modes the format differs
Images saved in 640x480 16 colour mode by PCGRA have the following
format:
integer width in pixels
integer height in pixels
for each row there are 4 planes representing Blue Green Red and
Intensity.
Each plane is (width+7)/8 bytes long
To find the colour of a pixel you OR together the corresponding
bits on each of the planes.
Images saved by IMED256 are in a much simpler format
Integer width (pixels*8)
Integer length pixels
Block of length x width bytes
Each byte is the colour information for a single pixel.
sp256c.c demonstrates the loading and display of images created
by IMED256.
I HOPE THAT YOU ENJOY MY PROGRAM
Nigel Salt
REGISTRATION
------------
If you wish to continue using this product please send $25/£10 to
the address below.
Nigel Salt
25 Lower Station Rd
Crayford
Kent
DA1 3PY
Phone 0322 553260
CIX ID nao@cix.complink.co.uk
RAX Nigel Salt on node 2:440/52.49