Anthony Thyssen schrieb: > Stephan Hennig on wrote... > | > | Converting bluebells_darker.jpg to grey scale alone returns an image > | with 255 colours: > | > | convert bluebells_darker.jpg -colorspace Gray grey.png > | > | I can't believe the best approximation of this image with 254 colours > | should result in 16 colours, but with IM it does: > | > | convert grey.png -colors 254 grey254.png > | > prehaps you should use a Q16 version of IM instead of Q8 > this has a higher quality internally, in which case you get a larger > variable of the greyscaling operation, for the quantization to play > with, and thus a finer control.
That seemed to do the trick. With the Q16 version -colors works as expected on grey scale images. Thank you for your helpful comments! Best regards, Stephan Hennig PS: Though, I'm still wondering why Q8 fails so bad. Shouldn't 24 bit be enough to reduce the number of colours of simple grey scale images? I can't see any reason this operation hits Q8's limits. _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
