help with blended materials? trying to do smoke. SOLVED

Vampyre · Post by **Vampyre** » Mon Feb 18, 2008 4:35 pm

ok i just recreated the blend with the gimp and sampled the pixel in teh middle, and its right whre it should be.. 127,127,127. if it were skewing the blend factor in order to make it appear smooth on a monitor thats too bright (a 2.2 gamma monitor) the color value in the center pixel should be darker ,right? which brings us back to square one.?

im just trying to understand the process so i know how to better make blend maps in the future.

It seems to me that by telling indigo that the assumed gamma is 2.2 were telling it that the image is *not* gamma corrected. and thats why it works, because the images made with the gimp are not gamma corrected... of course, maybe thats what you've been trying to explain to me all along

Kram1032 · Post by **Kram1032** » Tue Feb 19, 2008 2:58 am

Well, that's the result of the whole thing

Maybe, this helps...
http://en.wikipedia.org/wiki/Gamma_correction

Vampyre · Post by **Vampyre** » Tue Feb 19, 2008 3:15 am

unfortunately, no. I understand the basics of gamma in regards to video, what i dont understand is how indigo 'sees' the image maps. or, after loading them, how it uses that information to blend materials. But I guess that a bit of mystery is what makes life fun.

Kram1032 · Post by **Kram1032** » Tue Feb 19, 2008 3:19 am

When the programs you use are set to gamma 2.2, they will create images, based on that.
Indigo needs an own input of gamma, so that it allows correct looks at all kinds of monitors, as Mac Monitors have the lower gamma of 1.8...
And I just read, that non-CRT-screens actually have a gamma of approx 2.5 O.o

Vampyre · Post by **Vampyre** » Tue Feb 19, 2008 4:35 am

I guess my confusion is just that it seems like the whole gamma mess should be automatic in some fashion. I still dont get why it makes a difference. the image file is a perfect linear blend, from 0 to 255 left to right.. in my small, ignorant head, indigo should load that and convert it to percentages from 0 to 100 percent, and be done with it.. but i guess its not that simple

2.5? that must be for LCD monitors. have u seen the new full color laser projector that was just invented? i'm guessing the dynamic color range on that thing is gonna be excelent. sorry... strayed off topic. anyways, i think i'll just stick with 2.2 for my assumed gamma settings. thanks for being so patient with me and explaining everything

Kram1032 · Post by **Kram1032** » Tue Feb 19, 2008 8:55 am

Yeah, it's not that simple

It was automatic (although not in that way, you're thinking of), but Ono decided to make it variable, with standard on gamma 2.2, to let users choose themselves, what fits them best - especially useful for mac-users

Didn't hear of that laser.... Link?

Yeah, stick with 2.2. That should be the easiest

Vampyre · Post by **Vampyre** » Tue Feb 19, 2008 5:37 pm

thts what had me confused i think, in blendigo the default assumed gamma is 1. the cool laser projector thing isn't yet available but i'm hoping it takes off, i thinkwhats amazing is how they got all three lasers to line up.. here's a link

http://www.microvision.com/pico_project ... index.html

also, i finally finished my render with the smoke, posted it in finished artwork.

http://www.indigorenderer.com/joomla/fo ... #47375[url][/url]

help with blended materials? trying to do smoke. SOLVED

hmm