Legacy ImageMagick Discussions Archive

At a high level, -unsharp finds edges and exaggerates the differences. A helpful tutorial: http://www.cambridgeincolour.com/tutorials/unsharp-mask.htm http://www.cambridgeincolour.com/tutorials/local-contrast-enhancement.htm -unsharp has three parameters radius & sigma (area function) amount/gai...

I reread the documentation and pinpointed why I was confused. The documentation implies that -sparse-color uses image coordinates. This seems proper to me, and intuitive since that makes all three of us correct on our first instinct. But the images within the documentation look like they were create...

Hopefully we helped with your initial problem Wolfy, so I'll continue on with this coordinate system question. Some IM commands use 0,0 to mean the center of the top-left pixel (pixel coordinates), while others use 0,0 to mean the top-left edge of the image (top-left edge of the top-left pixel) (ima...

Instead of 50%, try %[fx:0.50*w]. In some places this works, others not (support is expanding). When it does, it is far more flexible that simple percents.

Thank you for the past history and future roadmap. All of your efforts are much appreciated!

Sure, I could do this: So -fx and -level supporting -channel is unnecessary. But it sure is convenient, so why the difference?

-channel applies to -fx, but not -poly or -average. Is there reason? convert -size 500x500 xc:#F00 xc:#0FF -channel B -average ave.png convert -size 500x500 xc:#F00 xc:#0FF -channel B -poly "0.5,1 0.5,1" poly.png convert -size 500x500 xc:#F00 xc:#0FF -channel B -fx "(u+v)/2" fx.p...

That's a great tip to know. I could never figure out why I couldn't make a tiff out of both a photo and a greyscale mask and open them together as layers in Gimp. Now I know how. Yippee! I think this used to work for me. This is a change. I think we can agree this isn't an IM bug? There is nothing ...

At first the unexpected behavior made no sense. All of the images were in the tiff file. IM could see them. GIMP could see them. GIMP could even open them, as long as it was one at a time. So why not all at once? And why does a seemingly random selection of layers get opened while others are silentl...

When the images are in colour, with +compress, I see almost no difference in file size. ... Monochrome images are smaller in the newer IM. Compressed sizes are also smaller. I doubt that this is relevant. Good observation! When all of the images are TrueColor (tiff:photometric: RGB), it works prope...

I am on Windows 7, also using the latest GIMP. Are you seeing the tiff file size change? Further testing: I get the same undesirable result using 6.8.4-8, 6.8.5-6, and 6.8.6-3. Opening as images works. The problem is only with opening as layers. The more images I add to the file, the more that appea...

Way back at version 6.8.3-0 I could create a tiff containing multiple images and open it in GIMP as layers (or separate images). Using version 6.8.4-8 and up there are several changes. The tiff is significantly fewer bytes. GIMP lists all the images and can open any one, but can't open all at once. ...

It will depend on how you want to specify the area and new location. Here is one option: convert src.png ^ ( -clone 0 -crop 64x50+0+0 ) ^ ( -clone 0-1 -compose Dst_Out -composite ) ^ -delete 0 +swap ^ -geometry +0+4 -compose Over -composite ^ dst.png 1 - read in file 2 - copy area to be moved 3 - er...

For each image, do you know exactly what area you want moved and by how much? Is the background always transparent?

Did the left side get moved down 4 pixels, or is that a rotate?