Re: set depth of bitmap image
Anthony Thyssen <[email protected]>
| Newsgroups | gmane.comp.video.image-magick.user |
|---|---|
| Message-ID | <20100414111743.7217fd82@wraith> |
On Tue, 13 Apr 2010 06:31:31 +0000 [email protected] wrote: | | Hello, | | Newbie trying to set the pixel depth when creating a bitmap image from raw 8-bit grayscale data (i.e. each byte is one pixel 0x00 - 0xff) | | > convert -size 100x200 -depth 8 gray:rawdata image.bmp | | This gives me image.bmp with 24-bit depth. But how can I force .bmp to be also only 8-bit? | | Running ImageMagick-6.6.1-Q8 on Vista x32 | | Best regards | /Håkan | -depth 8 means 8 bits per value, it does not control the number of channels in the output image. If your BMP image is 24 bit it is still outputing RGB data! 8 bits of red green and blue! The -depth should after the image read. See the top of IM Examples Basics as to why. http://www.imagemagick.org/Usage/basics/ Now for you problem. try -type Grayscale For example... convert -size 100x200 gray:rawdata -depth 8 -type Grayscale image.bmp The -type basically controls the sub-formats of output images. Anthony Thyssen ( System Programmer ) <[email protected]> -------------------------------------------------------------------------- "I didn't think I was going to survive that...". "YOU WERE CORRECT", replied Death. -- Terry Pratchett, "Men At Arms" -------------------------------------------------------------------------- Anthony's Castle http://www.cit.griffith.edu.au/~anthony/ _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users