 |
|
|
|
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On Thu, 12 May 2005 19:43:53 +0200, Christoph Hormann
<chr### [at] gmx de> 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
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Fredrik Eriksson wrote:
> It is Windows only;
Well - that disqualifies it for most uses. ;-)
I don't see a reason why you would deliberately write a command line
program windows only...
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
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Warp wrote:
>
> http://www.evermotion.org/free/sky0041.zip
Yes, there is definitely something wrong...
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 23:23:21 +0200, Christoph Hormann
<chr### [at] gmxde> wrote:
> Fredrik Eriksson wrote:
>> It is Windows only;
>
> Well - that disqualifies it for most uses. ;-)
>
> I don't see a reason why you would deliberately write a command line
> program windows only...
I didn't explicitly make it Windows only. I am just not completely sure of
the portability of the libraries used, particularly the OpenEXR library.
If there is sufficient interest, I might make the effort to clean up the
code and release the source, but otherwise I just don't want to bother.
It would probably work as-is on Linux, but I don't currently have a Linux
installation to test with.
--
FE
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On Thu, 12 May 2005 22:47:57 +0200, Warp <war### [at] tagpovrayorg> wrote:
> 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.
Couldn't you do those things in HDRShop, before converting?
--
FE
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Fredrik Eriksson wrote:
> I am just not completely sure
> of the portability of the libraries used, particularly the OpenEXR
> library.
Quoting www.openexr.com : "OpenEXR has been ported to GNU/Linux, OS X
10.2, Win32, and IRIX. It should be fairly easy to port to other
UNIX-like operating systems."
So apparently OpenEXR wouldn't cause much trouble...
--
Vincent
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On Fri, 13 May 2005 00:00:15 +0200, Vincent LE CHEVALIER
<gal### [at] libertysurffr> wrote:
> Fredrik Eriksson wrote:
>> I am just not completely sure
>> of the portability of the libraries used, particularly the OpenEXR
>> library.
>
> Quoting www.openexr.com : "OpenEXR has been ported to GNU/Linux, OS X
> 10.2, Win32, and IRIX. It should be fairly easy to port to other
> UNIX-like operating systems."
>
> So apparently OpenEXR wouldn't cause much trouble...
The question is: Does the OpenEXR source compile *and work* as-is on those
platforms, or does "has been ported" simply mean "someone, somewhere,
knows what must be changed to make it work on platform X"?
The big issue, though, is whether anyone even cares about this program. I
could just release the source and let the users worry about portability,
but I would have to clean it up a bit first, and I'm not going to make
that effort unless people will benefit from it.
--
FE
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Vincent LE CHEVALIER nous apporta ses lumieres en ce 2005-05-12 16:40:
> 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...
>
Think of 48bpp png as "extended dynamic range". It can have 64bpp if you make use of
the alpha
chanel (rgba).
Alain
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
