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How to handle negative values

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Ron C
Posts: 18
How does one handle negative values in FF? In applying a simple derivative filter or hi pass, there are negative output unless a constant is added. Often that constant is middle gray (0x808080). High pass does this automatically but how might I do it when using Blend?

Thanks,
RON C
Ronald E Chambers
Posted: August 8, 2007 2:23 pm   Details E-Mail
Vladimir Golovin
Administrator
Posts: 3446
Filters: 55
Ron -- in the current version the RGBA output of all components is normalized into the 0...1 range (double precision floating point). This means no high dynamic range and no negative values. The future math components will be able to output unclamped HDR with negative values.
Posted: August 9, 2007 5:11 am   Details E-Mail
Ron C
Posts: 18
Looks like I'm a tad early for playing with FF. Can't wait for the full range and the math component.

RON C
Ronald E Chambers
Posted: August 9, 2007 9:09 am   Details E-Mail
Vladimir Golovin
Administrator
Posts: 3446
Filters: 55
Yes, originally FF wasn't intended to serve as a programming environment -- we wanted to keep it simple for non-technical users.
Posted: August 9, 2007 9:29 am   Details E-Mail
Ron C
Posts: 18
Hope I'm not messing up the plan too much. I remember developing a software system like FF for another use and after time it became very general purpose with 100's of components and even components that were high speed combinations of components. FF will be used on other than photos etc. so expect many requests.

Thanks,
RON C
Ronald E Chambers
Posted: August 9, 2007 9:35 am   Details E-Mail

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