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New in version:
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GMImage.LevelChannel
Component: GraphicsMagick
Version: 2.0
Mac OS X: Works
Windows: Works
MBS( "GMImage.LevelChannel"; ImageRef; ChannelType; blackPoint; whitePoint; midPoint )
Parameters
| Parameter | Description | Example value |
|---|---|---|
| ImageRef | The image reference (a number returned from the GMImage.New functions) | 1 |
| ChannelType | One of the following values: RedChannel = 1 (RGB Red channel), CyanChannel = 2 (CMYK Cyan channel), GreenChannel = 3 (RGB Green channel), MagentaChannel = 4 (CMYK Magenta channel), BlueChannel = 5 (RGB Blue channel), YellowChannel = 6 (CMYK Yellow channel), OpacityChannel = 7 (Opacity channel), BlackChannel = 8 (CMYK Black (K) channel), MatteChannel = 9 (Same as Opacity channel (deprecated)), AllChannels = 10 (Color channels), GrayChannel = 11 (Color channels represent an intensity.) | 1 |
| blackPoint | The black point. | 0 |
| whitePoint | The white point. | 1.0 |
| midPoint | Optional, the middle point. | 1.0 |
Result
Returns "OK" on success.
Description
Level image channel.Adjust the levels of the image by scaling the colors falling between specified white and black points to the full available quantum range. The parameters provided represent the black, mid (gamma), and white points. The black point specifies the darkest color in the image. Colors darker than the black point are set to zero. Mid point (gamma) specifies a gamma correction to apply to the image. White point specifies the lightest color in the image. Colors brighter than the white point are set to the maximum quantum value. The black and white point have the valid range 0 to MaxRGB while mid (gamma) has a useful range of 0 to ten.
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MBS Realbasic Plugins - Pfarrgemeinde Ministranten Nickenich
