TIFF to BMP conversion problem

Hello,

I want to convert a TIFF file with multi images in it to a series of BMP files. The BMP files must have only 8 Bit grey values, coded with PseudoClass and must be subsampled. Therefore I've used the following commands:


1.     Conversion to PNG, because I didn't find all these flags for BMP files:

gm convert input.tif -colorspace GRAY -colors 256 -define png:bits-per-sample=8 -format png -resize 418x384 +adjoin png8:"output-%03d.png"

2.     Conversion to bmp files in a bash for loop:

for f in `ls *.png`; do gm convert $f bmp/${f%.png}.bmp; done

The output of 'gm identify output-000.bmp' now has the information "PseudoClass 256c". That seems to be right. But if I copy these files on a windows system, the image properties in a file manager pointed out, that the file has a bit depth of 32 bit. But I need 8 bit instead. By the way: Is there a command to check this with Graphicsmagick too?

I know, that this conversion is possible with Graphicsmagic, because I did it already in the past, but I Can't remember how.

How can I do this conversion?


Thanks in advance,

Heiko

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