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Decimal values were a test to check if it is possible to get Marlin to accept them for a better resolution in the power levels.
I don’t think you will need it.
Optimised raster will not engrave white areas of an image.
For example you have logo in JPG that is all black but round on a white background.
The normal raster mode will engrave the whole picture as defined by the size.
Optimized raster will skip all white parts outside the engraved image and shorten the processing time quite a bit.
It is as said really helpful if you have a lot of white background, for an image that is quite dark all over it won’t have real effect on getting shorter engraving times.