Color tweaking HDRI within Carrara ? - Polyloop

Toleytoe · 19th January 2007, 17:14

Is there a way to tweak a HDRI color/hue effects within Carrara? I have tried aprox 10 different hdri files and found one that lights my indoor scene really well. However I would like to reduce the overall color blue that it casts slightly. I have read in the Modo forum that there is a layer or something within their hdri properties panel that you can add to adjust color, hue, etc. I have HDRI Shop demo program but cannot find a function to adjust this issue either. I know I can adjust some of the color/hue problems in Photoshop, post render , but it's a pain in the butt.....Any ideas....? oh yeah, I'm a bit of noob with Carrara so be gentle...

Patrick210 · 19th January 2007, 17:57

You can only adjust the strength in Carrara, not color.

medeamajic · 19th January 2007, 22:37

It would be best to adjust everything in PhotoShop before importing into Carrara. PhotoShop is designed to manipulate photo images Carrara is not.

Patrick210 · 19th January 2007, 23:46

When did Photoshop start working with HDRI's?

Markku · 20th January 2007, 00:20

I know nothing about this, but this link may be helpful in regards to Photoshop and HDRI.

http://www.cambridgeincolour.com/tut...amic-range.htm

Does it apply?

Patrick210 · 20th January 2007, 06:08

Very cool, I'm still using CS, didn't know CS2 had HDRI.

Couerl · 20th January 2007, 06:33

I think if you have CS or CS2 you can get the CS3 beta and it has some interesting features like advanced lighting and some kind of 3D support. I'm curious to know more about it and will probably get CS2 this year sometime.
http://www.adobe.com/products/photoshop/family.html

smudgee · 20th January 2007, 20:25

Im not sure, but i think i had a freeware app called HDRI shop, that might help weak the colour ,sorry if im wrong , cant check rightnow.

smudgee

jones2000u · 20th January 2007, 22:14

Yes, photoshop CS2 reads .hdr files and will create them from a series of up to 9 bracketed digital shots. There's a couple of good tutorials, but I can't remember where - a search will locate them quite easily, I think.

HDRI Shop isn't meant to re-colour the image composites, so Photoshop is the best way to do it - or put a colour gel on some lights around and about to influence the overall scene lighting effect.

One important point is that hdr files are 32 bit instead of the usual 8/16 bit, so it's very easy to mess up the colour information in the file. It's worth reading a bit about the background of HDRI to get the reason for it in the first place, because that might influence the way it's used in a scene.

CS2 is one of the (few) really worthwhile upgrades so I would recommend it as a big step on from 7 (skip 8). I heard a rumour that CS3 is probably going to be tailored more for the digital photographer, so I may skip this one and see what they do in version 10.

bwtr · 21st January 2007, 01:30

CS3 is a great forward step--in the available beta. It says it will come in two versions hinting that the second (?how much dearer) version will have some 3d capability.

It's worth going through all the video tutes for CS3--WOW!

jones2000u · 22nd January 2007, 00:59

really? how so, Brian? has adobe got a load of previews up... - I'll have to go and look at it properly. Photoshop has always supposedly had some 3d capability, but the only person who I knew who could make it work really amazingly was an old-school photo-retoucher (as in paintbrush and dyes) and he would never tell me how he did it, and now I've lost touch with him...

bwtr · 22nd January 2007, 05:25

http://movielibrary.lynda.com/html/modPage.asp?ID=327

Oh! Joy!

Save your sheckles!

The 3D stuff is hinted at for a seperate version in about--March?
(BUT it may be for a lot of extra money?)

jones2000u · 22nd January 2007, 13:45

well I had a look at just a couple of the videos and it looks like a big leap up - particularly that stuff about smart filters.

I'll take your advice and see what happens after march!

rendererer · 24th January 2007, 17:46

Hmmm. I have CS2 and it doesn't want to open my .hdr files.

I certainly agree that sometimes the color cast in HDR files is undesirable. I wish Carrara could at least ignore the color in an HDRI environment, if not tweak it.

- Joe

jones2000u · 24th January 2007, 18:04

That's strange Joe. But there does seem to be massive compression in an HDRI - a few megs opens up to a lot of megs. The ones off the original developers site download at about 3 or 4, but then open up to around 100.

The colour cast is the result of the HDRI composing - the maximum colour range/information from the ambient light at the time of the photography, so to the eye they look quite strange. Have a look at Flickr, because a lot of people experiment with it for the effect.

So ideally, you would be creating your own HDRI to suit the room/scene atmosphere you are building. At least I would, if I could work out how to use those probe thingies!

19th January 2007, 17:14	#1 (permalink)
Toleytoe Vertex Join Date: Jul 2006 Posts: 6	Color tweaking HDRI within Carrara ? Is there a way to tweak a HDRI color/hue effects within Carrara? I have tried aprox 10 different hdri files and found one that lights my indoor scene really well. However I would like to reduce the overall color blue that it casts slightly. I have read in the Modo forum that there is a layer or something within their hdri properties panel that you can add to adjust color, hue, etc. I have HDRI Shop demo program but cannot find a function to adjust this issue either. I know I can adjust some of the color/hue problems in Photoshop, post render , but it's a pain in the butt.....Any ideas....? oh yeah, I'm a bit of noob with Carrara so be gentle...

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19th January 2007, 17:57	#2 (permalink)
Patrick210 Pixar want to hire me! Join Date: Apr 2004 Location: Florida, USA Posts: 549	You can only adjust the strength in Carrara, not color.

19th January 2007, 22:37	#3 (permalink)
medeamajic Now, I learn animation Join Date: Sep 2005 Posts: 1,028	It would be best to adjust everything in PhotoShop before importing into Carrara. PhotoShop is designed to manipulate photo images Carrara is not.

19th January 2007, 23:46	#4 (permalink)
Patrick210 Pixar want to hire me! Join Date: Apr 2004 Location: Florida, USA Posts: 549	When did Photoshop start working with HDRI's?

20th January 2007, 00:20	#5 (permalink)
Markku Studying 3D at nights Join Date: Jan 2006 Location: Finland Posts: 86	I know nothing about this, but this link may be helpful in regards to Photoshop and HDRI. http://www.cambridgeincolour.com/tut...amic-range.htm Does it apply?

20th January 2007, 06:08	#6 (permalink)
Patrick210 Pixar want to hire me! Join Date: Apr 2004 Location: Florida, USA Posts: 549	Very cool, I'm still using CS, didn't know CS2 had HDRI.

20th January 2007, 06:33	#7 (permalink)
Couerl Polygurbs Join Date: Jul 2005 Location: Denver Posts: 1,301	I think if you have CS or CS2 you can get the CS3 beta and it has some interesting features like advanced lighting and some kind of 3D support. I'm curious to know more about it and will probably get CS2 this year sometime. http://www.adobe.com/products/photoshop/family.html

20th January 2007, 20:25	#8 (permalink)
smudgee Cube Join Date: Jul 2006 Posts: 81	Im not sure, but i think i had a freeware app called HDRI shop, that might help weak the colour ,sorry if im wrong , cant check rightnow. smudgee

20th January 2007, 22:14	#9 (permalink)
jones2000u NURBS Booleans are your friend Join Date: Jun 2006 Posts: 134	Yes, photoshop CS2 reads .hdr files and will create them from a series of up to 9 bracketed digital shots. There's a couple of good tutorials, but I can't remember where - a search will locate them quite easily, I think. HDRI Shop isn't meant to re-colour the image composites, so Photoshop is the best way to do it - or put a colour gel on some lights around and about to influence the overall scene lighting effect. One important point is that hdr files are 32 bit instead of the usual 8/16 bit, so it's very easy to mess up the colour information in the file. It's worth reading a bit about the background of HDRI to get the reason for it in the first place, because that might influence the way it's used in a scene. CS2 is one of the (few) really worthwhile upgrades so I would recommend it as a big step on from 7 (skip 8). I heard a rumour that CS3 is probably going to be tailored more for the digital photographer, so I may skip this one and see what they do in version 10.

21st January 2007, 01:30	#10 (permalink)
bwtr Brian Join Date: Jul 2005 Location: South Australia Posts: 2,094	CS3 is a great forward step--in the available beta. It says it will come in two versions hinting that the second (?how much dearer) version will have some 3d capability. It's worth going through all the video tutes for CS3--WOW!

22nd January 2007, 00:59	#11 (permalink)
jones2000u NURBS Booleans are your friend Join Date: Jun 2006 Posts: 134	really? how so, Brian? has adobe got a load of previews up... - I'll have to go and look at it properly. Photoshop has always supposedly had some 3d capability, but the only person who I knew who could make it work really amazingly was an old-school photo-retoucher (as in paintbrush and dyes) and he would never tell me how he did it, and now I've lost touch with him...

22nd January 2007, 05:25	#12 (permalink)
bwtr Brian Join Date: Jul 2005 Location: South Australia Posts: 2,094	http://movielibrary.lynda.com/html/modPage.asp?ID=327 Oh! Joy! Save your sheckles! The 3D stuff is hinted at for a seperate version in about--March? (BUT it may be for a lot of extra money?)

22nd January 2007, 13:45	#13 (permalink)
jones2000u NURBS Booleans are your friend Join Date: Jun 2006 Posts: 134	well I had a look at just a couple of the videos and it looks like a big leap up - particularly that stuff about smart filters. I'll take your advice and see what happens after march!

24th January 2007, 17:46	#14 (permalink)
rendererer Vertex Join Date: Nov 2004 Posts: 11	Hmmm. I have CS2 and it doesn't want to open my .hdr files. I certainly agree that sometimes the color cast in HDR files is undesirable. I wish Carrara could at least ignore the color in an HDRI environment, if not tweak it. - Joe

24th January 2007, 18:04	#15 (permalink)
jones2000u NURBS Booleans are your friend Join Date: Jun 2006 Posts: 134	That's strange Joe. But there does seem to be massive compression in an HDRI - a few megs opens up to a lot of megs. The ones off the original developers site download at about 3 or 4, but then open up to around 100. The colour cast is the result of the HDRI composing - the maximum colour range/information from the ambient light at the time of the photography, so to the eye they look quite strange. Have a look at Flickr, because a lot of people experiment with it for the effect. So ideally, you would be creating your own HDRI to suit the room/scene atmosphere you are building. At least I would, if I could work out how to use those probe thingies!