mateo_sancarlos opened this issue on Feb 14, 2004 ยท 7 posts
mateo_sancarlos posted Sat, 14 February 2004 at 12:33 AM
Attached Link: http://www.openexr.org/
Just wanted to mention that Jo Meyer, developer of Terragen and its HDRI plug-in, has passed along the above link for ILM's free HDRI software.
falconperigot posted Sat, 14 February 2004 at 2:41 AM
But Carrara can only handle .hdr files.
mateo_sancarlos posted Sat, 14 February 2004 at 2:32 PM
Dang! I knew there had to be a catch, unless there's some way to convert exr to hdr files, such as by changing the extension. So I guess this means that OS X users are limited to Terragen if they want to create hdr files. From what I saw, looking at how EXR converts a jpeg file, it multiplies the gamma by 2.2 and exports a stretched version of the jpeg, either uncompressed or recompressed.
falconperigot posted Sun, 15 February 2004 at 3:12 AM
Attached Link: http://www.anyhere.com
Greg Ward provides some HDRI software for Mac. I work on a PC so can't say whether it will do what you want. The following page also has some good links for HDRI images: http://www.lightworks-user.com/hdri.htm HTH Mark
mateo_sancarlos posted Sun, 15 February 2004 at 3:27 PM
Yes, that Greg Ward software looks good. Thanks for the link. It says to take multiple shots of a scene, from severely under-exposed (no white pixels) to severely over-exposed (no black pixels), which it then combines somehow into an HDR image. The software apparently produces a 32-bit or 33-bit image. When I used the HDRI browser (Photosphere) to open an EXR image (ILM format), it was able to open it, recognize it as EXR, and said it was a 48-bit image. This leads me to believe that: 1. Carrara may be able to use EXR images. 2. EXR images have "smoother" dynamic range than HDR images.
glought posted Thu, 19 February 2004 at 5:32 PM
Attached Link: found another one that works.
This program will let you create and modify HDRI files that do work well in Carrara. If it works for you please let them know. :)
falconperigot posted Fri, 20 February 2004 at 2:31 AM
HDRShop is an excellent (free) program - and not just for HDR files: you can also use it for manipulating LDR images for backgrounds or backdrops. But it is at present only for WinPC which is no good for Mac users like mateo_sancarlos! .EXR files are more accurate format than .HDR. Whether Carrara can be got to read the format is a different matter. Mark