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convert in -resize wxh out:
Resize an image so it fits in a box, preserving scaling.
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convert bob.pdf -resize 100x100 -density 600x600 EPS2:bob.eps:
Convert a PDF file to an EPS. Density is DPI. Resize is the size in pixels of the result. Hence, the size in inches is (resize / density).
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convert in -modulate brightness,saturation,hue out:
Adjust the % brightness, saturation, and hue, respectively. Values of 100 leave the qualities unchanged.
convert(1), ImageMagick(1).