My test was with IM v7.0.3-5, and the result is much cleaner than the OP (v7.0.4-8). Perhaps there is a bug in that version.
The OP result looks like what I get when I use "-sample" instead of "-resize".
Problems with resizing a previously rendered label
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snibgo
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Re: Problems with resizing a previously rendered label
snibgo's IM pages: im.snibgo.com
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GeeMack
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Re: Problems with resizing a previously rendered label
I agree. Using Windows HDRI static, when I run the commands using IM 7.0.4-8 there is a pretty obvious stairstep effect along the edges. When I simply change the command from "magick" to "convert" to run it on IM 6.9.7-6 the result is noticeably better.
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snibgo
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Re: Problems with resizing a previously rendered label
I've reported this as a bug: viewtopic.php?f=3&t=31405
snibgo's IM pages: im.snibgo.com
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GarbageSauce
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Re: Problems with resizing a previously rendered label
Yeah I think it is a bug. I downloaded ImageMagick-6.9.7-8-Q16-HDRI-x64-dll.exe and installed that. Results come back much nicer. I appreciate the help guys. It seems as though when one bug gets fixed, another manifests. Frustrating isn't it.
Re: Problems with resizing a previously rendered label
Add -channel RGBA to your command-line. Does that resolve the problem?
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GarbageSauce
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Re: Problems with resizing a previously rendered label
Did you try:
We tried and compared to the results from IMv6 and got a RMSE of 32 whereas without -channel rgba we got 5925:
Code: Select all
magick asdf.png -channel rgba -resize '240x90^>!' test.pngCode: Select all
-> compare -metric rmse test.png imv6.png diff.png
31.9101 (0.000486917)-
GarbageSauce
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Re: Problems with resizing a previously rendered label
Oh I tried putting the -channel rgba after the resize argument originally. Putting it before seems to do it. Is there any reason why that is?
Re: Problems with resizing a previously rendered label
Consider it a transient problem. We were trying to better align IMv7 with IMv6 given IMv7's enhanced channel support. Our alignment obviously did not work. We will push a new point release likely tomorrow to fix this problem.
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GarbageSauce
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Re: Problems with resizing a previously rendered label
Interesting. Well, software development can be frustrating. Thanks again and good luck.
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GeeMack
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Re: Problems with resizing a previously rendered label
A few tests using IM 7.0.4-9 (on Windows 10 64) seem to indicate this problem has been resolved.
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GarbageSauce
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Re: Problems with resizing a previously rendered label
Yay! Can I just say that the this community is one of the best in terms of direct support than any other I have used. Props.
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fmw42
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Re: Problems with resizing a previously rendered label
Yes, settings must come before the operators that use those settings.GarbageSauce wrote: ↑2017-02-14T09:48:09-07:00 Oh I tried putting the -channel rgba after the resize argument originally. Putting it before seems to do it. Is there any reason why that is?