Legacy ImageMagick Discussions Archive

Glad it works on linux. The second rotate, -rotate 45 is the one I meant. That's why I added -append as part of the title to this report.

I've tried it again. Still hanging. It seems to be related to size of input image. 800x600 px works fine; 4000x3000 px doesn't.


S.

This command having started, hangs absolutely dead. It works okay without -rotate.

convert IN.JPG ^
( +clone -rotate -22.5 ) ^
-compose Src -composite ^
( +clone -flip ) ^
-append ^
-rotate 45 ^
OUT.JPG

( +distort SRT 45 works as expected.)


Thanks.

Hi, all. A question regarding "banding" when compositing gradients. I have some (approx. 800) full-size crops (jpegs) of cloud formations. I need to apply a gradient similar to a weak, rectangular vignette to perform what you might call the digital equivalent of edge-burning in order to de...

Bump.

Bump.

Any further thoughts on this?



Jo

Hi ho. Original http://img193.imageshack.us/img193/2889/img2641eg.jpg ImageMagick: Separated L*a*b Lightness Channel http://img143.imageshack.us/img143/4527/imseparatelablightnessc.jpg GIMP: Decompose to L*a*b Lightness Channel http://img641.imageshack.us/img641/1484/gimpdecomposetolablight.jpg Jo

Standard deviations and their implications aren't really my bag but I get the general drift - the lower the number the better. My comparison was by eyeballing: GIMP and original ImageMagick http://img293.imageshack.us/img293/9056/smallimg2641oldlab.jpg New ImageMagick http://img340.imageshack.us/img...

Well, you've got me there. I've no access to PhotoShop (or GIMP), just their (converted) output files; but virtually everything to do with running anything on Windows has 6500K on it so you're likely right. My monitor calibration software says D65 with gamma 2.20.



Jo

Okay. I tested it, and you won't be surprised - it works!

Just for curiosity's sake; why are the L channel separations in PhotoShop, GIMP, etc. so much lighter in tone?

Anyway, thanks a lot - very speedy service. Cheers.



Jo

Groovy! Baited breath etc.


Thanks for the heads up.



Jo

Bump!


Thanks.



Jo

Hi. Like to draw your attention to a possible bug (or at least an inconsistency of implementation) in Lab when translating between colour spaces. Fuller explanation here: http://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=16223&p=58811&sid=01cb5c3d2350bef7ac5fcf1cc96cd641&am...

Yes. Not a bad idea.



Jo

Hey, fmw42 . Thanks for the response. Yup, I understand the difference between Lab and RGB ; but the result of flipping modes should be barely perceptible - if at all - to the human eye. Photoshop manages translations Lab/RGB - RGB/Lab well enough so I expected ImageMagick to be similar - swapping t...

Hi all. I've just been attempting to sharpen images using the L channel of Lab. This should be straightforward but the overall brightness/gamma is substantially altered. An example: Running -colorspace Lab -channel R -unsharp "0x0.8" +channel on http://img179.imageshack.us/img179/3820/img2...