In order to have more
compability between Windows, TBitmap and TPNGObject features, TPNGObject
introduces three different transparency modes:
-
None -
When there are no transparent areas in the image
-
Bit -
Each pixel may be full transparent or opaque against the background
-
Partial
- Pixels may be translucid (semi transparent)
TPNGObject provides a read-only property to obtain the transparency mode
for the image, TransparentMode
property. Also changing
TransparentColor property changes the image to Bit transparency mode
always, loose partial transparency information.
Bit
and partial transparency