Legacy ImageMagick Discussions Archive

Hi all! I need to convert images to 8-bit BMPs with one byte per pixel and a palette. The palettes in the output BMPs must have exactly 256 entries (even if some are unused). The entries must be the grayscale levels 0..255 in increasing order. That is, index 0 is RGB triple (0,0,0) etc. So far I've ...

Lovely. Thankyou.

Hello I want to use IM to separate an RGB image into three greyscale images, resize the channels independently and then recombine them. I'd like to do it in one command line if possible. Is it possible to select that the -resize operator only applies to a selected one of the images? For example ...

I've just noticed there is a -compose operator, copy-opacity, which might work. I would have to create a canvas using xc:, with a solid color and the required opacity and the size of the image whose alpha channel I want to set, and composite it onto the image with copy-opacity. The downside is I ...

Thanks anthony. I thought this was a bug in normalize but later worked out that it seemed to be equivalent to -contrast-stretch 1%, and often it looks good. I began to use -contrast-stretch 0 instead. It looks like a lot more than 1% of pixels get burned by normalize but I guess when the dynamic ...

Hi, is there a quick way to fill an image's alpha channel with a constant? -fx and -recolor are overkill and are quite slow. i would like to do what -dissolve does but 'convert' doesnt support it. thanks

Should this command line burn pixels? convert img.jpg -normalize img-normalized.jpg If so, what are the formulas it uses, and are these formulas listed in the documentation? If not, there appears to be a bug in normalize.... img.jpg: http://i237.photobucket.com/albums/ff319/r_ling/img.jpg img ...