> > pilrc will take any depth bitmap and convert it to the correct
> > depth :) i added that code a *long* time ago (maybe +1 year now)
> > :P
>
> Ok, say I want a 4 bit grayscale bitmap. How do I save the file so that
> it is only 4 bit depth?
you dont :)
> If I have to save it as a 16 color bitmap, which color indexes would be
> used for the 4 colors? Are you saying that if you have a bitmap family
> that the bitmaps might be:
>
> 1bmp, 4bmp, 4bmp, 8bmp and pilrc would convert the 2nd bitmap to 2 bit?
> If so, which colors are chosen for the 4 colors from the 16 in the
> original file?
well, 16 grays will need to be saved as 256 color min.. 16
color bitmap doens't support 16 different grays :) it uses
a VGA palette
1bmp, 4bmp, 8bmp, 8bmp would work
if you take a look at the pilrc sources, bitmap.c - you'll see
this (the code is open source, go get it):
---
/*
* The 1bit-2 color system palette for Palm Computing Devices.
*/
int PalmPalette1bpp[2][3] =
{
{ 255, 255, 255}, { 0, 0, 0 }
};
/*
* The 2bit-4 color system palette for Palm Computing Devices.
*/
int PalmPalette2bpp[4][3] =
{
{ 255, 255, 255}, { 192, 192, 192}, { 128, 128, 128 }, { 0, 0, 0 }
};
....
---
they are the palette definitions.. further on you'll see
----
....
for (i = 0; i < dstPaletteSize; i++)
{
dstPalette[i][0] = PalmPalette4bpp[i][0];
dstPalette[i][1] = PalmPalette4bpp[i][1];
dstPalette[i][2] = PalmPalette4bpp[i][2];
}
.....
// whats the (r,g,b) tupile at the index?
w = getBits(pbmi, dx, pbSrc, x, yT, 32, &a, &r, &g, &b);
...
int v = BMP_RGBToColorIndex(r, g, b,
dstPalette,
dstPaletteSize);
----
trust me.. pilrc does all the work :) try it :P
// az
[EMAIL PROTECTED]
http://www.ardiri.com/
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