Pre and post processing parameters
These properties control effects applied before the actual corruption effects.
These usually make the image prettier!
-crunch, -blackbg, and -div are especially useful.
Image contrast applied before corruption. 0 is neutral, -1 is the lowest contrast, 1 is the highest.
| Original | No contrast | -contrast 0.5 |
-contrast -0.5 |
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#2: node pngfucker.js -input eathan.png -frames 20 -fps 10 -crunch 60 -seed 50 -splits 1 -regions 0 -shift 0 -div 1 -blackbg 1 -rmin -10 -rmax -8
#3: node pngfucker.js -input eathan.png -frames 20 -fps 10 -crunch 60 -seed 50 -splits 1 -regions 0 -shift 0 -div 1 -blackbg 1 -rmin -10 -rmax -8 -contrast 0.5
#4: node pngfucker.js -input eathan.png -frames 20 -fps 10 -crunch 60 -seed 50 -splits 1 -regions 0 -shift 0 -div 1 -blackbg 1 -rmin -10 -rmax -8 -contrast -0.5
Multiplies output image size by this value.
Divides output image size by this value.
This is often useful, because corruption on large, detail-filled images often looks bad.
-div and -crunch is a good combination to make corruption look better!
Note that both -mul and -div are applied! You can use whichever you wish.
Lets you reuse corruption randomisation!
If no seed is specified, a random one is picked.
Using -staticseed 0 means that the internal seed for each frame of an APNG will be different, creating a jittery corruption effect to it.
Using -staticseed 1 keeps it constant across all frames, so that your eyes don't go pop from the corruption!
This doesn't affect the ability to recreate the APNG corruption, so using the same -seed value will yield the same corruption with APNGs!
Epilepsy warning, flashy example
| Original | Without -staticseed
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-staticseed 1 |
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#2: node pngfucker.js -input cube.png -seed 0 -blackbg 1
#3: node pngfucker.js -input cube.png -seed 0 -blackbg 1 -staticseed 1
Resizes image to this percentage in pre-processing, and resizes them back to normal in post-processing, to "crunch" the pixels.
This gives a nice, pixel-like effect to the glitching, and it mostly works well with small low-detail images (256x256, 512x512, you get the idea)
This parameter is a good alternative to -div, because you won't have to resize it back to normal size afterwards.
NOTE: Don't add a percent sign! Resizing and crunching uses nearest-neighbor interpolation, so you can enjoy crispy glitching.
| Original | -crunch 100 |
-crunch 50 |
-crunch 15 |
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#2: node pngfucker.js -input eathan.png -seed 2 -splits 1 -splitmin 50 -clamp 0 -blackbg 1 -regions 3 -crunch 100
#3: node pngfucker.js -input eathan.png -seed 2 -splits 1 -splitmin 50 -clamp 0 -blackbg 1 -regions 3 -crunch 50
#4: node pngfucker.js -input eathan.png -seed 2 -splits 1 -splitmin 50 -clamp 0 -blackbg 1 -regions 3 -rmin 2 -rmax 5 -crunch 15
Normally, due to the way pngfucker corrupts images, alpha bits get mangled with RGB bits, causing changes in transparency for some pixels.
Usually, it looks way too "bright" on a white background, so -blackbg 1 underlays a black background behind the image, increasing the contrast of the image in the process and giving the corruption a nice rough effect.
| Original | Without -blackbg
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-blackbg 1 |
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NOTE: If you're viewing this with a dark theme (or anything that makes the page dark), you might not see the difference easily.
#2: node pngfucker.js -input eathan.png -seed 2 -splits 1 -splitmin 50 -crunch 50
#3: node pngfucker.js -input eathan.png -seed 2 -splits 1 -splitmin 50 -crunch 50 -blackbg 1
This "localises" the corruption on a transparent image/APNG, ignoring corruption outside the "main area" of the image (unless its pixel delta is >64)
Without it, corruption affects the whole image. See the examples below for more information!
Epilepsy warning, flashy example
| Original | Without -clamp
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-clamp 1 |
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#2: node pngfucker.js -input cube.png -seed 0
#3: node pngfucker.js -input cube.png -seed 0 -clamp 1