Indigo Renderer Forum

hey dudes
so im stressing out cuz we got final reviews day after tomorrow and here i am trying to finish some renderings to so i can show the critics what a wonderful building ive designed and make it look like ive done shitloads of work this semester, even though i drank half of it away and spent the other half making up excuses.

i started fucking around in Photoshop, trying to get rid of some annoying fireflies/noise on one of my renderings to make it usable so i can start rendering the next one.

so between pulling out my hair and chugging illegal amounts of coffee at 4 in the morning, i found a technique that might already be known but which works pretty well for squashing any persistent annoying fireflies.

it goes like this:

- take the guilty image into Photoshop (GIMP, whatever, lets not get into that argument)
here is a piece of mine (1 to 1):



- duplicate the image onto another layer

- push it through the Highpass filter with a radius of about 0.5 pixels.

- now crank the shit out of the contrast on the resulting image. after using some hardcore Levels Adjustment, mine looked like this:



- invert this layer

- set it to multiply

- duplicate this layer again if needed.

my result looked like this:



so the problem with this technique? sometimes sharp highlights can get a bit lost. you can see it a tiny bit on the chair back at the bottom right of the image (yes, that is a table and a chair).

in this case, all you have to do is take a small eraser and brush over it on the "denoiser" layer and your highlight will come right back. not sure how it works on all scenes, but, hell, when you need to clear em up quick, details can take a running jump.

i hope this helps someone! take 'er easy!

tommy

Thanks dude.

This might become handy.

Thank you Tom! I'm going to try it..

Thx, very usefull for large render

GREAT. very useful technique
thanks for sharing stompintom

Thanks StompinTom! And I wanna remind of the "oldschool" way, how we did
it in the early stages of Indigo with a tool coded by Beltane. It's still available
on flipcode. ;o))

nb: It works pretty well too, but maybe isn't that versatile! Hmm, would
like to know what Beltane is doing ... hehe. ;o)



take care
psor

If the firefly is fully white, it results in a fully black image, so, maybe, you should limit it to 50% or something

great technique, indeed