TRasterImage.TransparentColor property
Color used to represent transparent pixels in the image.
Declaration
property TransparentColor: TColor read GetTransparentColor write SetTransparentColor default clDefault;Description
TransparentColor is a
TColor property which indicates
the color used to represent transparent pixels in the raw image data. Pixels
with this color are not drawn on the image - so they have a transparent
appearance. The default value for the property is
clDefault.
TransparentColor is used along with TransparentMode to determine
whether a fixed color is used for transparency, or if the transparent color
is read from a specified pixel in the raw image data.
When TransparentColor contains clDefault, the
RequestTransparentColor method is used to get the transparency
color value from the bottom-left pixel in the raw image data.
When setting a new value for the property, the TransparentMode property may be
updated as well. When clDefault is assigned to the property, TransparentMode
is set to tmAuto. For other color values, TransparentMode is set
to tmFixed.
The ApplyTransparent method is called to apply the effective transparency for the image using the values in Transparent, TransparentColor, and TransparentMode.
Modified in LCL version 4.2 to call ApplyTransparent when the property value has been changed.
See also
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.