effective_area: Return non transparent area
In moodymudskipper/tweak: Modifies PNG images
View source: R/trim_transparency.R
Description
Return non transparent area
Usage
1
2
effective_area(img, type = c("rel", "abs"), alpha_treshold = 0,
brightness_treshold = 1, reverse = FALSE)
Arguments
img
raster object
type
rel (0 to 1) or abs (pixels)
alpha_treshold
pixels with alpha under this value will have it set to 0
brightness_treshold
pixels with brightness over this value will have alpha set to 0
reverse
if reverse is true the darker pixels will have alpha set to 0
moodymudskipper/tweak documentation built on May 20, 2019, 8:49 a.m.
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View source: R/trim_transparency.R
Description
Return non transparent area
Usage
1 2 | effective_area(img, type = c("rel", "abs"), alpha_treshold = 0,
brightness_treshold = 1, reverse = FALSE)
|
Arguments
img |
raster object |
type |
rel (0 to 1) or abs (pixels) |
alpha_treshold |
pixels with alpha under this value will have it set to 0 |
brightness_treshold |
pixels with brightness over this value will have alpha set to 0 |
reverse |
if reverse is true the darker pixels will have alpha set to 0 |
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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