Legacy ImageMagick Discussions Archive

How can I get a measurement / metric of the compressibility of an image? I think it is related to the details, texture, and maybe number of colours on an image.

Do you mean that standard deviation which is listed by the command "identify -verbose"? Format: JPEG (Joint Photographic Experts Group JFIF format) Mime type: image/jpeg Class: DirectClass Geometry: 390x527+0+0 Resolution: 96x96 Print size: 4.0625x5.48958 Units: PixelsPerInch Type: TrueCol...

Thx, it works now flawlessly and quick. I had to use a few other options to ./configure, because I doesn't have X installed on my VPS. (--with-freetype=yes, --without-x)

try compiling without OpenMP and without HDRI and see if that helps. I have heard that onn some Unix systems OpenMP can cause a slowdown. Are you sure that your input image has no profiles? What do you get from identify -verbose on your input file? Are you running an old version of libjpeg? Quality...

If I compile from source with option:
Resizing works quick again. However command "montage" refuse to work.

convert -version Version: ImageMagick 6.8.9-8 Q16 i686 2014-10-09 http://www.imagemagick.org Copyright: Copyright (C) 1999-2014 ImageMagick Studio LLC Features: DPC HDRI Modules OpenCL OpenMP Delegates: bzlib cairo fontconfig freetype gslib jng jp2 jpeg lcms lqr ltdl lzma pangocairo png ps rsvg tif...

On my VPS:
real 0m15.258s
user 0m14.197s
sys 0m0.893s

On my home machine:
real 0m45.332s
user 0m47.323s
sys 0m2.580s

I am using Arch Linux, and after the last upgrade the resizing with mogrify / convert became extremly slow: more than 10 seconds/image (720x540=>266x192). Before it was quick enough, a few seconds per / 70 images. What can I do to make it work faster again?

Btw, is there any way to automatically guess the right gamma value for an image?

Oh, I see. There is no graphical control window for this filter called Ylevels. It can be used only with function arguments. I have tried the first command you mentioned, this is the result: http://i.imgur.com/765LzVR.jpg Top image was generated with avisynth, bottom with ImageMagick. They reasonabl...

Sorry, what does exactly mean: "control for it" and "screen snap"? Could you be more specific and verbose? (I am not a native english speaker), My avisynth file (yl.avs) looked like this when I generated the above image (one have to install MaskTools.dll and ylevels.avsi to the a...

Here you can see Ylevels filter in action:
Full resolution image: http://i.imgur.com/etjLWz7.jpg

I don't understand exactly as well how it works, but the visual appearance of the videos are very nice with this Ylevels filter applied.

Is it possible to reproduce avisynth's Ylevels filter with ImageMagick?
http://avisynth.nl/index.php/Ylevels
http://forum.doom9.org/showthread.php?t=79898

To make dark video screenshots brighter and visible.

I have a headless VPS with Arch Linux. I try to render text on to some images with command mogrify and option "label": mogrify -path ./splice -verbose -filter Lanczos -resize 320x240 -fill blue -font /usr/share/fonts/TTF/FreeMono.ttf label:text -splice 1x1 -format bmp image.jpg , but all I...