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GMImage.AveragePixelValue

Calculates the average pixel value.

Component Version macOS Windows Server FileMaker Cloud FileMaker iOS SDK
GraphicsMagick 3.0 Yes Yes Yes Yes Yes
MBS( "GMImage.AveragePixelValue"; ImageRef { ; X; Y; Width; Height } )   More

Parameters

Parameter Description Example value
ImageRef The image reference number. 1
X Optional
X-Position of the rectangle.
$left
Y Optional
Y-Position of the rectangle.
$top
Width Optional
The width of the rectangle.
Default is width of image.
$width
Height Optional
The height of the rectangle.
Default is height of image.
$height

Result

Returns the average pixel value.

Description

Calculates the average pixel value.
Value is in range from 0.0 to 1.0 depending if it is more black (0.0) or white (1.0).
Make sure the pixels are in RGB format before you call this method. (Use GMImage.SetType with value 6.)
This function is designed to test if a certain area in the image is white or black.
Does not check alpha channel!

Version 9.1 and later uses full image if rectangle is missed.

See also

Example Databases

Blog Entries

Created 18th August 2014, last changed 18th February 2019


GMImage.AutoOrient   -   GMImage.BaseColumns

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