display a JPEG image on a 8 bit screen color depth


My application uses VC++ 6.0. Could anyone help me out by letting me
know how could I display a JPEG image on a 8 bit screen color
depth.This JPEG image is getting displayed using my app. when i use a
16 bit screen color depth.Is there any function by which i can manually
specify the bitmap color depth  in my app.

Thanks a lot.


7/24/2006 4:32:41 PM
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You could look at GDI+ or check out what code might be available at www.codeproject.com

On 24 Jul 2006 09:32:41 -0700, anita.k.123@gmail.com wrote:

>My application uses VC++ 6.0. Could anyone help me out by letting me
>know how could I display a JPEG image on a 8 bit screen color
>depth.This JPEG image is getting displayed using my app. when i use a
>16 bit screen color depth.Is there any function by which i can manually
>specify the bitmap color depth  in my app.
>Thanks a lot.
Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm
newcomer (15972)
7/24/2006 4:40:05 PM
anita.k.123@gmail.com wrote:
> Hi
> My application uses VC++ 6.0. Could anyone help me out by letting me
> know how could I display a JPEG image on a 8 bit screen color
> depth.This JPEG image is getting displayed using my app. when i use a
> 16 bit screen color depth.Is there any function by which i can manually
> specify the bitmap color depth  in my app.
> Thanks a lot.
> Anita

hi anita,
i did something similar long time ago, must be under win 3.1 or so.

think you (still) have to do reduce the color information by yourself
to create a 256 color table - actually you've got only about 220 colors
for use by yourself cause some color table entries are reserved for the
there already some algorithms to do color reduction like
* nearest color
* error diffusion
* floyd steinberg

the GDI offers some functions to handle 256 color palettes like

the handling of palettes (if i remember correctly) is like juggling, if
your window gets the focus, you must set your palette and redraw your
image, if it looses the focus, you must restore the system palette and
redraw your image (which at this time looks usually very ugly due to
the mapping of your colors to the system palette).

when i program a graphics application which shows hi/true color images
i usually deny the execution of the program when running under a 256
color mode. it's just too much affords to support this.

have a nice day,

7/25/2006 5:41:08 AM

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