Image Color Order

Is there a way to know which color order to set when loading an image? That is, how can I test whether the output device is a RGB device or a BGR device?

Demo32 sources simply set fIsBGRDevice to TRUE at the beginning, then I can switch to FALSE and back to TRUE. But is there a way to initialize a similar flag for any current output device, without having the user to manually switch to the correct settings if the image is not displayed with the correct colors?

Or *every* Windows output device is BGR, so the initial setting for flag fIsBGRDevice is always correct?

TIA

In Windows GDI, a device-independent bitmap (DIB) is stored in the BGR color order. Painting functions in LEADTOOLS draw on GDI device contexts; that's why our demos default to BGR. There could be other devices (such as some printers) that render image data in the RGB order. Check out ulPrimaryOrder member of the GDIINFO structure, which describes the graphics capabilities of a device. Here's a link to the DDK documentation:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/graphics/hh/graphics/grstrcts_181c0d6e-5908-4505-8093-956eefc87c85.xml.asp

Amin Dodin
LEADTOOLS Technical Support

Amin Dodin

Senior Support Engineer
LEAD Technologies, Inc.