Legacy ImageMagick Discussions Archive

This also happens when going from uncompressed TIFF to LZW compressed TIFF in Debian (ImageMagick 6.9.4-4 Q16 x86_64) and in Windows 10 (7.0.8-7 Q16 x64 2018-07-17): convert -compress lzw uncompressed.tiff compressed.tiff Example file (public domain): http://www.robotplanet.dk/f/imagick/uncompressed ...

fmw42: That's a good idea actually. I could probably just script some stuff on top of that to give me some more intuitive controls, and then my script would generate the necessary imagemagick commands to do FFT --> apply boosts/attenuations (frequency curve response) --> inverseFFT. I'll report back ...

@Juce: Wow, those are great. Only the third image seems to be affected by the X-Y orientation of the algorithm, but the other examples are great. Having to type in coefficients directly might scare off most users (and me too, most likely). But I guess it would be a similar operation as calculating ...

I think you need to rename the file to .jpg and see if this helps. Most likely it's a jpeg file, and these are usually expected to have the .jpg extension.

Oh, why did I miss this interesting discussion. I've done stuff like this using ImageMagick, and I think you might want to look into the FFT stuff. Now I'm at work atm. so I can't dive into this topic, but I believe you would be able to deduct a lot of information about blurryness from the FFT data ...

Sorry, I almost forgot to put up the original...


PS: This image is free for use by anyone, so be my guest!

Two more to give some more examples of the effect, now that I'm at it... : Band A: Boost: -6 dB, frequency = 50 pixels, bandwidth: medium wide Band B: Boost: +6 dB, frequency = 20 pixels, bandwidth: medium wide Band C: Boost: -6 dB, frequency = 6 pixels, bandwidth: medium wide http://www.robotplanet ...

I've made a quick example which only shows a part of what you would be able to do with this, but because I've been using normal image processing algorithms here, I cannot easily recreate steep filters. The "slope" of these filters is most likely 6dB/octave, because they are probably 1. order filter ...

Your approach would indeed give a highpass filter, but it gets fairly cumbersome (not to mention slow) if you want to achieve more complex equalization this way. I was thinking of a full-featured parametric equalizer here, which means the following controls (for a 1-band version, that is): A) Boost ...

Maybe this already exists, and I'm just really bad at using google, but i'll share my little idea anyway. I deal with audio a lot, and have even coded numerous plugins for that. I've often noticed the similarity between the algorithms used there and what you see in image processing. The most simple ...

This conversion is extremely complicated - more than JPEG, I'd dare to say. Even on the amiga itself, you get wildly different results depending on which software to use. I've tested this a lot, and I think you get the best results by using either ImageFX or Art Department Pro which are also ...

Fair enough, here's a quick guide:

1) Choose File / Open and load an image
2) Type this text string into the text area: -level 30,60%
3) Press Enter. The image should now change, and get more contrast.

Other text strings give other results. I've added a few examples here.

We all know how tedious is can be to deal with long paths on the command line, and having to switch between typing in stuff, then launching a viewer to see the resulting output. So if you need to quickly figure out some adequate command line parameters, here's a little tool I just wrote, that you ...

Not an expert here, but I think when you get these "/usr/bin/ld: warning: libpcre.so.0, needed by /usr/local/lib/liblqr-1.so, may conflict with libpcre.so.1" errors, it's a result of mixing pre-built FreeBSD packages with things you've compiled yourself, thus ending up with references to different ...

make ltdl/libltdlc.la CC ltdl/loaders/ltdl_libltdlc_la-preopen.lo In file included from ./ltdl/libltdl/lt__private.h:54, from ltdl/loaders/preopen.c:32: ./ltdl/libltdl/lt__glibc.h:61:18: error: argz.h: No such file or directory *** Error code 1 Stop in /root/ImageMagick. Tried doing an "svn up" but ...