YOUR ACCOUNT

Login or Register to post new topics or replies
Nebukadnezar
Posts: 64
Filters: 1
Is there a "proper" or intended way to visualize HDR components or convert/scale/remap them to the 0-1 range?
Currently I'm using HDR Blend and mix it with a 50%grey or black background (depending on the later use) at very low opacity but I assume there is a better way. Adjustments don't seem to read out HDR. (edit: ok, got the part with the yellow circles.)
  Details E-Mail
Morgantao
Can't script

Posts: 2185
Filters: 20
What yellow circles?
Honestly, HDR is kinda over my head... I'm a what I see is what I get kind of guy. Math and HDR are more theoretical (since my LCD isn't HDR, and what are negative color values all about?) so I can't visualize them in my head.
  Details E-Mail
Nebukadnezar
Posts: 64
Filters: 1
Sorry, I was talking of the yellow markers that show if a components accepts or outputs HDR.

The point is, because it´s hard to visualize them in ones head and for "debugging" purposes I´d like to take the lowest/smallest/most negative value and the brightest one and map them from 0 to 255 or 1. (Tried an linear elevation gradient , but that seems to loop/circle for out of range values instead of shrinking them. )

If the range of the HDR is to big and the information in question is only a small part of that range, the remapped LDR wouldn´t be of much help either,(though one could adjust the range manually), but in other cases one could see what's going on.

So my question is if there is a way in Filter Forge to do this.
  Details E-Mail
Morgantao
Can't script

Posts: 2185
Filters: 20
So you want to transate the image from [-255]-[255] range to [0]-[255] range?
Maybe some kind of a math conversion? If I didn't suck at math maybe I could help smile:|
  Details E-Mail
Nebukadnezar
Posts: 64
Filters: 1
Yes! smile:)
Only that both extremes had to be read out/found by the component first.
  Details E-Mail
Darrell Plank
Posts: 42
Filters: 4
Here's a filter with a group in it that scales HDR. Since neither remapping nor sliders allow for negative numbers, I have to use both a slider and a "negate" checkbox. If the negate checkbox is checked, the corresponding slider value is treated as negative. The sliders also have to have an upper limit - they don't go to infinity. These sliders go to 100 because of the remapping inside the "To HDR" group. To allow for larger values, change the remapping. Anyway, it just scales the incoming HDR image to lie between the min and max as given by the sliders. The incoming profile in the filter lies between -40 and 30 and is scaled into a 0-1 profile on output.

ScaleHDR.ffxml
Darrell
  Details E-Mail

Join Our Community!

Filter Forge has a thriving, vibrant, knowledgeable user community. Feel free to join us and have fun!

33,712 Registered Users
+19 new in 30 days!

153,534 Posts
+31 new in 30 days!

15,348 Topics
+72 new in year!

Create an Account

Online Users Last minute:

31 unregistered users.