bmp file issues

[steve]

I am reading in a bitmap file using the microsoft bmp classes and most
all of the files are as follows

Width :640:
Height :480:
Bits :8:
Upside Down :1:
Core :0:
Palette Size :256:
Compression :0:

and are indexed images. Using fread and fseek to pull off the header
and start reading at the first pixel. When I get the indexed pixel
values and compare them to values in Photoshop they do not match. I
have read that bitmaps are "upside down". Do I need to flip things
around? I am assuming the header is 1077 bytes (0x0 through 0x436).

Thanks

[Malcolm McLean]

"steve" <St******************@gmail.comwrote in message

>I am reading in a bitmap file using the microsoft bmp classes and most
all of the files are as follows

Width :640:
Height :480:
Bits :8:
Upside Down :1:
Core :0:
Palette Size :256:
Compression :0:

and are indexed images. Using fread and fseek to pull off the header
and start reading at the first pixel. When I get the indexed pixel
values and compare them to values in Photoshop they do not match. I
have read that bitmaps are "upside down". Do I need to flip things
around? I am assuming the header is 1077 bytes (0x0 through 0x436).

You are probably reading the palette as raster data / not adding padding
bits at the end of each line.

If you go to my website there is a portable BMP loader, under "Basic
Algorithms".

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[Barry Schwarz]

On Mon, 18 Aug 2008 10:18:17 -0700 (PDT), steve
<St******************@gmail.comwrote:

>I am reading in a bitmap file using the microsoft bmp classes and most
all of the files are as follows

C supports classes?

>
Width :640:
Height :480:
Bits :8:
Upside Down :1:
Core :0:
Palette Size :256:
Compression :0:

and are indexed images. Using fread and fseek to pull off the header
and start reading at the first pixel. When I get the indexed pixel
values and compare them to values in Photoshop they do not match. I
have read that bitmaps are "upside down". Do I need to flip things
around? I am assuming the header is 1077 bytes (0x0 through 0x436).

And your question about the C language (as opposed to your program
logic) is?

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