If you don't need True Color [24 bit], use -depth 256 [8bit]
That can save a tremendous amount of memory.
Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".
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Belay that order. We suspect that ridera means -colors 256 . However since JPEG is RGB or CMYK it does not support a colormapped image. Instead try this command:
- convert -crop 10x10 source.jpg -strip -quality 75 slice%d.jpg