Legacy ImageMagick Discussions Archive

It works fine with XQuartz on my Mac. Use display, then left-click the image to get the menu. You are correct. My mistake. I had not used that in a while. What I have trouble with is getting coordinate measurement features that used to exist. But perhaps I do not recall the key options to use along ...

It works fine with XQuartz on my Mac. Use display, then left-click the image to get the menu.

It looks like the gray might work, but since the images appear to be basically grayscale, why not use a highly colored background, like a bright red piece of paper? Finding the gaps with that should be easier.

@snibo, thanks! That's the approach I was looking for. (I often find that I just need a new way of thinking about what I'm trying to do to get IM to work for me.)

Turns out that I don't want to add the border before trimming, or at least I don't want to add a black one. A white one works fine.

I'm working with single rows of pixels in binary images, so a bunch of white and black pixels. What I'd like to do is make sure that all the pixels between the first and the last black ones are also black. For example, if the row were: 0 0 0 1 0 0 1 0 0 0 It would become 0 0 0 1 1 1 1 0 0 0 Can I do ...

Good to know, though it still re-compresses when that option is chosen.

Could you also use exiftool to alter the orientation tag of your jpegs?
Some apps will ignore this tag (like IM), which is why it might not work for you.

Yeah, I do this a lot and the problem just started.

I'm trying to do a simple reduction of the depth of some grayscale images (of text) that I have. They're in PNG format. When I use a depth of 2 or 3, the entire image gets compressed into the left side of the canvas, leaving the side half black. It only seems to happen with gray PNG files. I can ...

This seems to be all fixed in IM 7.0.8-12.

Is there a problem with tiff group4 and fax compression? I'm having trouble getting good compression with them, and perhaps coincidentally these are the two compression schemes that were affected by this patch . For example, magick logo: -threshold 80% -alpha off -monochrome -compress METHOD ...

Is there a broader problem with tiff compression? I'm having trouble getting group4 and fax (which I don't normally use) to give me good compression and these are the two compression schemes that were affected by this patch . For example, magick logo: -threshold 80% -alpha off -monochrome -compress ...

Ditto using magick in place of convert on my Mac with

Version: ImageMagick 7.0.8-10 Q16 x86_64 2018-08-18 https://www.imagemagick.org

"preserve-ratio" seems like a useful option to have on the shave command (or someplace similar).

This slightly simpler command works for me and uses whatever color I want with -fill:
ImageMagick 7.0.7-30 Q16 x86_64 2018-05-06