Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".
Do you have timings for with and without the -unsharp? -unsharp internally contains a -blur, which is an expensive operation. Your radius is small so it shouldn't be too expensive, but your other operations are cheap. Settings (-size, -gravity, +repage, and sometimes -profile) consume virtually no time.
Why are you running -auto-level -unsharp 0x1 on the white canvas? Could they be moved to within the parentheses? Have you considered using -extent, avoiding the need for a white canvas?
Why are you running -auto-level -unsharp 0x1 on the white canvas? Could they be moved to within the parentheses?
That's so obvious I can't believe I didn't try that- in this case the canvas isn't even showing so I didn't consider it.
I start with a white canvas because that is how I am creating borders when I need them, but I may remove it for this case if it creates a significant speedup. Thanks for the reply
Simply moving -auto-level -unsharp 0x1 to within the parentheses will halve their time because they are currently being run twice.
I see what you are doing with the white canvas, and that method often makes sense. In your case, -extent may achieve the same output easier and faster. http://www.imagemagick.org/Usage/crop/#extent
convert target.jpg -resize 3000x -profile sRGB.icm -auto-level -unsharp 0x1 -gravity center -background white -extent 3000x2400 target2.jpg
