Vincent LE CHEVALIER <gal### [at] libertysurffr> wrote:
> Christoph Hormann has a tool on his web-page called HCR-Edit, that might 
> be what you're looking for : 
> http://www-public.tu-bs.de:8080/~y0013390/hcredit/index.html

  I tried it and when I try to open a hdri image it just crashes.

-- 
                                                          - Warp

Post a reply to this message

Christoph Hormann <chr### [at] gmxde> wrote:
> Cinepaint: http://cinepaint.sourceforge.net/

"Windows version is currently broken and won't be available again until
Glasgow"

  Seems like my cause is hopeless.

-- 
                                                          - Warp

Post a reply to this message

Warp wrote:
> Vincent LE CHEVALIER <gal### [at] libertysurffr> wrote:
> 
>>Christoph Hormann has a tool on his web-page called HCR-Edit, that might 
>>be what you're looking for : 
>>http://www-public.tu-bs.de:8080/~y0013390/hcredit/index.html
> 
> 
>   I tried it and when I try to open a hdri image it just crashes.
> 
Indeed... The funny thing is that it does open some other images (found 
at http://athens.ict.usc.edu/Probes/)... No idea what the problem can be :-(

-- 
Vincent

Post a reply to this message

Warp wrote:
> Vincent LE CHEVALIER <gal### [at] libertysurffr> wrote:
> 
>>Can anyone tell me more about 48bpp png format ? Is it able to store 
>>float values ?
> 
> 
>   Truecolor images usually store 8 bits per color component. Some
> image formats, such as for example png, support also 16 bits per color
> component (making a total of 48 bits per pixel).
> 
Ok, that was what I thought. So no floats involved, right ? Just asking, 
because I'm considering a project right now, which will need high 
dynamic range images, and thus I'm looking for the format that would 
suit my needs best...

-- 
Vincent

Post a reply to this message

On Thu, 12 May 2005 15:26:23 +0200, Warp <war### [at] tagpovrayorg> wrote:
>
>   Seems like my cause is hopeless.


If all you need is to convert HDR images to PNG16, the following script  
will do it. Output with +FN16 and the proper resolution (and replace the  
filename of course). It's a little slow, but at least it works under  
Windows.




#version unofficial MegaPov 1.1;


global_settings {
	assumed_gamma 1.0
}


camera {
	orthographic
	location <0, 0, 10>
	sky y
	up y
	right x
	direction -z
}



plane {
	z, 0
	texture {
		pigment {
			image_map {
				hdr "grace_probe.hdr"
				once
			}
			translate <-0.5, -0.5, 0>
		}
		finish {
			diffuse 0
			ambient 1
		}
	}
}



-- 
FE

Post a reply to this message

"Vincent LE CHEVALIER" <gal### [at] libertysurffr> wrote in message 
news:42828a0b$1@news.povray.org...
> Megapov can use directly hdr files in a scene, as explained in section 4.3 
> of Megapov's help file. If you just want to view hdr files, then HDRView 
> will do the trick : http://athens.ict.usc.edu/FiatLux/hdrview/ . Also, the 
> page http://athens.ict.usc.edu/Research/HDR/ is I believe a good starter 
> about High Dynamic Range Images.
>
> Hope this helps...
>
> -- 
> Vincent

Thank you, that does help :^}>
Steve Shelby
http://www.shelbyvision.com

Post a reply to this message

Warp wrote:
>>http://www-public.tu-bs.de:8080/~y0013390/hcredit/index.html
> 
> 
>   I tried it and when I try to open a hdri image it just crashes.
> 

I have to say i did not recently maintain this program any more but i 
did never experience crashes when loading HDR images with the version i 
use here occasionally.  I am not completely sure though if the version 
on the website is completely up-to-date.  Could you point me to an image 
that causes it crash?

Note i have felt myself the need for a simple hdr to xxx converter (xxx 
being png or ppm - it does not really matter in the end) - combining it 
with your favourite image viewer would allow a quick preview of hdr 
images and it could also be used for conversion tasks.  But i did not 
yet find the time to write one.

Christoph

-- 
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 03 May. 2005 _____./\/^>_*_<^\/\.______

Post a reply to this message

On Thu, 12 May 2005 19:43:53 +0200, Christoph Hormann  
<chr### [at] gmxde> wrote:
> Note i have felt myself the need for a simple hdr to xxx converter (xxx  
> being png or ppm - it does not really matter in the end) - combining it  
> with your favourite image viewer would allow a quick preview of hdr  
> images and it could also be used for conversion tasks.  But i did not  
> yet find the time to write one.


Seeing as how I already had a program that could convert HDR <--> OpenEXR,  
it was a relatively small task to add rudimentary PNG support. It can read  
PNG files with 8 or 16 bits/component, and write PNG files with 16  
bits/component. It's a very simple program, so no gamma correction,  
exposure control etc.
It is Windows only; I don't want to have to check all of it for  
portability. Tested on XP and 98SE.

If anyone is interested, you can find it at:
http://hem.bredband.net/b230591/hdr2exr.zip



-- 
FE

Post a reply to this message

Christoph Hormann <chr### [at] gmxde> wrote:
>  Could you point me to an image that causes it crash?

http://www.evermotion.org/free/sky0041.zip

-- 
                                                          - Warp

Post a reply to this message

Fredrik Eriksson <noo### [at] nowherecom> wrote:
> If all you need is to convert HDR images to PNG16

  I would also like to be able to tune the exposure/contrast/whatever
of the hdri image before saving it.
  I suppose that is also possible with megapov, but I don't have it installed.
Perhaps I should.

-- 
                                                          - Warp

Post a reply to this message