Digital Light & Color

I've used the monochrome transformation with filters to good effect, but I'm interested in (1) greater control via color channels, (2) some "classic" black and white contrast curves that I can apply and start to play with, (3) some techniques for adding simulated grain patterns (not noise)...

If one installs the 32 bit version, can one reinstall the 64 bit version later with no additional charge?

I'm ready to upgrade to the latest PWP release. Which install is more "sure fire that everything works" or "stable" or other similar conservative, play-it-safe criteria? What are the specific benefits of the 64 bit build? And also drawbacks, bugs, any missing function, etc.? Same...

When I save files to lossless compressed tiff format, the preview thumbnail is not regenerated to reflect changes made to the image - it continues to reflect the original image prior to any editing. I prefer the lossless compressed TIFF format to reduce the disk space footprint. This makes it diffic...