Legacy ImageMagick Discussions Archive

ehm … that's true, thanks a lot. I was sure I had to prefix rgb: and I didn't try without.

Hi,

I was trying to get a jpg or png converting a .RW2 file (Panasonic Lumix raw format).

If I run dcraw -w -c image.RW2 | convert - -resize 366x275 image.jpg it works, not so if I run convert -depth 16 -size 366x275 rgb:image.RW2 image.jpg .

I tried different -depth and also gray:image.RW2 ...

Yes, seeing those images (often quite variable) I understand it's not so simple to find out a good method that can replace a direct look… Although, apart from imagemagick in particular, it seems strange in the year 2014 there is not an "easy" way to get the result I'm looking for.
So thanks a lot ...

If you believe that it's faster and more reliable, thanks for your suggestion fmw42.

But, ehm,.. I see here http://www.fmwconcepts.com/imagemagick/tidbits/image_info.php#color_percent two ways to get the percentage of just 1 color,.. I really don't know a smart way to get the percentage of 256 ...

Well thanks, so here http://goo.gl/TObXPX (Dropbox, less than 1MB) you can download a zip file with some sample images. The "yes_100" .jpg are the ones to spot. Even those with "yes_90" it would be good to find. But maybe it's asking too much.

My aim is to optimize their weight. In fact, if the JPG ...

Hi,
Thanks for your idea, but trying it with some images I have, this is what I get:

0.545707 … a rgb B&W image ( "white" background)
0.477206 … a rgb with some colors image ( "white" background)
0.489378 … a rgb (similar to previous one)
0.607111 … a rgb with some colors image ( "white ...

Hi,

I would understand if there is a "fast" way (the best "one line" command…) with IM to identify a nearly BW/grayscale (s)RGB picture.
I mean if an RGB image consists mainly of grays and/or black and white colors.

This demand because if I have a bunch of RGB jpg images and just some are almost ...