ImageAttributes::ClearGamma method (gdiplusimageattributes.h)
The ImageAttributes::ClearGamma method disables gamma correction for a specified category.
Syntax
Status ClearGamma(
[in, optional] ColorAdjustType type
);
Parameters
[in, optional] type
Type: ColorAdjustType
Element of the ColorAdjustType enumeration that specifies the category for which gamma correction is disabled. The default value is ColorAdjustTypeDefault.
Return value
Type: Status
If the method succeeds, it returns Ok, which is an element of the Status enumeration.
If the method fails, it returns one of the other elements of the Status enumeration.
Remarks
An ImageAttributes object maintains color and grayscale settings for five adjustment categories: default, bitmap, brush, pen, and text. For example, you can specify a gamma value for the default category, a different gamma value for the bitmap category, and still a different gamma value for the pen category.
The default color- and grayscale-adjustment settings apply to all categories that don't have adjustment settings of their own. For example, if you never specify any adjustment settings for the pen category, then the default settings apply to the pen category.
As soon as you specify a color- or grayscale-adjustment setting for a certain category, the default adjustment settings no longer apply to that category. For example, suppose you specify a gamma value and a color-adjustment matrix for the default category. If you set the gamma value for the pen category by calling ImageAttributes::SetGamma, then the default gamma value will not apply to pens. If you later clear the pen gamma value by calling ImageAttributes::ClearGamma, the pen category will not revert to the default gamma value; rather, the pen category will have no gamma value. Similarly, the pen category will not revert to the default color-adjustment matrix; rather, the pen category will have no color-adjustment matrix.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP, Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | gdiplusimageattributes.h (include Gdiplus.h) |
| Library | Gdiplus.lib |
| DLL | Gdiplus.dll |