"Christina Williams" on wrote...
| One correction to my last message.
|
| a >file * shows that the image made from version 5 is a png, 8 bit
| grayscale, whereas what the version 6 is making is an 8 bit colormap. I'm
| not sure why this is coming out when I specified -depth 8 gray:filename,
| which should make sure its a grayscale right?
|
| Is the only way to fix this problem to specify -type GrayScale? It seems
| like I could lose information by first making a colormap and then
| converting that into a grayscale instead of just making the grayscale to
| begin with.
So make the image greyscale first, using -colorspace gray.
-colorscape convert the image so it is stored in this colorspace
note however that Gray => Grayscale RGB
(each red,green and blue channel has the same value)
-type set the input and output type of image
-quantize colorspace in which to quantize images
using -colors or automatically for GIF or PNG8
A greyscale pallette PNG should thus be generated using
-type grayscale png8:image.png
However "-type" only defines (or should define) the final image type as
such it may be better to also set "-quantize gray" so that the
automatic "-colors 256" that IM uses to generate a limited color pallette.
convert image ......
-colorscape gray -quantize gray -colors 256
-type grayscale png8:image.png
What works and what don't work may indicate bugs or refinements that
should be reported to developers.
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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