Graphics Conversion: GIF|JPEG --> BMP --> shows up good, but hope to do better

Graphics Conversion: GIF|JPEG --> BMP --> shows up good, but hope to do better

Post by Dwight J » Wed, 06 Apr 1994 13:30:06

I use PMJPEG to convert the images to OS/2-2.0 bitmap format, choosing
the option to map to the pre-selected OS/2 system colors, which are
at most 256 colors.

However, I hope to do better.  Using CSHOW.exe I can display a picture
in 640 x 480 with 65536 colors on my XGA.

I entered the "system setup" folder and selected the "system" program
to look at my "screen options".  I have only 2:

                     640 x 480 x 256 (<-- currently using this option)
                     640 x 400 x 256.

Right now, I am confined to 256 colors even though my machine is capable
of displaying 65536 colors in the hi resolution mode.  Is there a way
to force OS/2 to use the 640 x 480 x 65536 mode?

Please respond by e-mail.



Graphics Conversion: GIF|JPEG --> BMP --> shows up good, but hope to do better

Post by jean saf » Tue, 19 Apr 1994 23:13:24

Does anyone know how to get them? Is asking the company that
makes them the only way or can they be downloaded from somewhere?

Thanx for any response.


                  I've seen things that you people ...


1. Graphics Conversion: GIF|JPEG --> BMP --> still shows up like @#$%$#%!! on OS/2 2.1's lockup-mode

Thanks for all the responses.  I figured out the solution for
Windows 3.1.  In order for Windows to use the highest resolution on
my VGA card, the colors are limited to 16, a palette of 16.
I used Alchemy to discover/extract the palette set by Windows and
then converted my 32 color image to a 16-color image, using that palette.
It was as easy as

            alchemy kaori.gif -f leaves.bmp -w -o

where "leaves.bmp" is loaded with Windows 3.1 and contains the
Windows-set palette.  (It is extracted "leaves.bmp".  Understand?)

But I still have one unresolved issue--about OS/2.  I have an IBM PC
running OS/2 2.1 and an IBM XGA card (and XGA driver).  I used alchemy
to convert my 256-color GIF to an OS/2 BitMaP.

Again, the colors are all messed up.  I get the same problem with XV.
If I convert the image to a gray-scale image with 256 levels of gray,
then the image is okay.

When I convert the GIF (with either XV or alchemy or any other conversion
program) to a 256-color BMP, the image's colors are screwed.  The image is
being displayed as the lockup-image.  By "lockup", I mean that I can lock up
the screen with a password; the desktop disappears, leaving a *.BMP
picture in its place.  

Instead of displaying the stupid "OS/2" *.BMP image, I want to see an image
of a pretty girl's face.  So, I'm converting the GIF to a 256-color BMP.

I *KNOW* that my XGA card is capable of displaying up to 65536 colors
simultaneously.  I've displayed that GIF using, say CompuShow, many times;
the image is completely normal--in beautiful 256 colors.

With regards to the OS/2 2.1 bitmap, What the hell am I
doing wrong?  How can I remedy the situation?

Please respond by e-mail.  Thanks.


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