Hi all, Thanks for the advice. I've tried using the png8:filename.png option, but unfortunately I'm still getting a 3 band output (I assume 24 bit?).
The -type GrayScale output seems like an appealing option but the output image from this is different from the output from version 5 which I am trying to duplicate, and I dont want to lose any information. (The output needs to be consistent with our previously recorded images) Is there something I am missing? It seems to me that if I am specifying -depth 8 gray: and also png8: then I should be getting an 8 bit grayscale output. Could it be related to the 6 bit to 8 bit situation of the raw image that I've mentioned previously? (to recap: from what I understand it is an image which in its raw form is actually 6 bit, padded to 8 bit in the begining. I didnt write the program that does it, so I dont know exactly whats done, but whatever it was worked just fine with version 5.) Thanks! Christina > "Christina Williams" on wrote... > | Hi all, > | > | I am observing a difference in the convert function between version 5 and > | version 6 of IM. On one computer with version 5.3.8, raw 8 bit images are > | converted to grayscale 8 bit pngs, but on computers with version 6 (I've > | tried 6.3.0 and 6.2.8), the same images are being converted to 24 bit RGB > | images, even after I specify -depth 8 gray. Here is the command I'm using > | > | convert -size 1023x1023 -depth 8 gray:filename.raw filename.png | > See IM Examples, Basics... > http://www.imagemagick.org/Usage/basics/ > It contains the basic differences between IM v5 and IM v6. > > try outputing to PNG8:filename.png > for a 8 bit pallette image. > > | I was able to force it into making a grayscale by adding -type GrayScale, > | but I'm not convinced that I dont lose information by doing this, and I'd > | prefer to convert the image correctly. > | > The -type GrayScale would also help in this regard. > > See http://www.imagemagick.org/Usage/basics/#type > > Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]> > ----------------------------------------------------------------------------- > Man may come, and man may go, but the earth abides. -- "The Earth > Abides" > ----------------------------------------------------------------------------- > Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/ > _______________________________________________ > Magick-users mailing list > [email protected] > http://studio.imagemagick.org/mailman/listinfo/magick-users > _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
