- basic_level:enhancement
https://wiki.hoku.emelibrary.org/
2026-05-26T04:06:55+00:00
https://wiki.hoku.emelibrary.org/
https://wiki.hoku.emelibrary.org/_media/wiki:logo.pngtext/html2025-06-26T09:02:49+00:00Anonymous (anonymous@undisclosed.example.com)blur_sharpen
https://wiki.hoku.emelibrary.org/basic_level:enhancement:blur_sharpen?rev=1750928569&do=diff
Enhancement – Blur, Sharpen
”Blur” by 4 pixels (left). Original, no change (middle). Sharpen, contrast of 4 (right).
[ ]text/html2025-06-25T21:34:29+00:00Anonymous (anonymous@undisclosed.example.com)invert
https://wiki.hoku.emelibrary.org/basic_level:enhancement:invert?rev=1750887269&do=diff
Invert
Inverts or flips over the pixel values.
For integers, the output is calculated by subtracting the pixel value from the the maximum value.
For 8-bit images, the output is 255-value.
For 16-bit images, the output is 65535-value.
For 32-bit integers, the output is 4294967295L-value.text/html2025-06-26T08:56:25+00:00Anonymous (anonymous@undisclosed.example.com)pack
https://wiki.hoku.emelibrary.org/basic_level:enhancement:pack?rev=1750928185&do=diff
Enhancement – Pack
”Pack” will adjust the contrast of the input image and convert it to an 8-bit unsigned integers. By default, it looks at the “statistics” of the whole image and linearly stretches the values to maximize the visibility. You may indicate a ”window” from which ”Pack” will get the data to compute the statistics for the image. Instead of “statistics”, you can use the “extremes” and stretch between the max and min values. Also, you can convert the output to 16-bit integer values…text/html2025-06-26T09:01:16+00:00Anonymous (anonymous@undisclosed.example.com)stretch
https://wiki.hoku.emelibrary.org/basic_level:enhancement:stretch?rev=1750928476&do=diff
Enhancement – Stretch
”Stretch” will adjust the contrast of the input image.
Linear
A ”linear” stretch will stretch the values of the image pixels between specified minimum and maximum values, and black and white. The output will be the same form as the input, either unsigned integers or floating point numbers. The min and max values can be specified. If left blank, the stretch will be between the min and max values of the input.