GEGL PERPSECTIVE DROP SHADOW (THEORY - NOT A PLUGIN YET))

contrast_ · **Joined:** Oct 31, 2020 **Posts:** 2013

This GEGL syntax makes a perspective drop shadow. It does NOT include the blue sky bevel.

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Code: Select all

id=1
dst-over aux=[ ref=1
median-blur radius=23 alpha-percentile=35
gaussian-blur std-dev-x=9 std-dev-y=9


opacity value=0.65
transform transform=matrix(0.92003078135894545,-0.038200287650397756,-4.8312409489881634e-05,-0.065568440826609717,0.17503055804991158,-0.0001353270199615508,1.5301303863525391,536.86383056640625,1)  


color-overlay value=#000000


lens-distortion zoom=-2
translate x=24  y=-300
]

In this thread I will brainstorm on how to make this a GEGL plugin with many perspective shadow options. This is difficult because GEGL cannot call Gimp's transform tools; recursive transform is a special exception that Gimp's team enabled for only that plugin. I plan on making a drop down list of different perspective shadows with an x and y move tool and a gaussian blur option.

contrast_ · **Joined:** Oct 31, 2020 **Posts:** 2013

If Gimp's team allowed Unified Transform and or Pesperctive Transform to also call "gegl:color-overlay" and "gegl:gaussian-blur" this plugin would not be needed. What I am doing is a sloppy excuse for not having those options in transform tools.

PixLab · **Posted:** Sun Oct 15, 2023 9:22 pm **(#3)**

contrast_ wrote:

If Gimp's team allowed Unified Transform and or Pesperctive Transform to also call "gegl:color-overlay" and "gegl:gaussian-blur" this plugin would not be needed. What I am doing is a sloppy excuse for not having those options in transform tools.

You mean, not having those options in "Drop Shadow"? :mrgreen:

If I may, and maybe it can help you to take in count this real life effect now, instead of re-writing your plugin later...
When I do those type of drop shadow, I do NOT use the Gaussian blur filter in the filters menu, but instead I use the Filters > Blur > Focus blur... to get a smooth transition of the increasing blur from start to end,
Because the shadow further away is, more blurred should it be, it's a real life physical property

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gasMask · **Posted:** Mon Oct 16, 2023 2:06 pm **(#4)**

I love it when you guys share. I learn a so much new stuff.