It also doesn't cover the full gamut - so when Pro photographers switch color space to Adobe RGB they do so to prevent color clipping for colors that are outside the RGB triangle. They can become over-saturated, it looks like green or red pixels that really stand out. Color accuracy: You will sometimes notice a color shift in an Radiance HDR, especially in very saturated areas. To really take advantage of this in Photoshop, you would need the ProEXR plugin, though. additional channels, layers, and metadata. In general, OpenEXR is better for two reasons: I believe Picturenaut uses PIZ, which is slightly less effective when your image has large uniform areas (like a clear blue sky, for example). Radiance HDR compression is always RLE, which works great on large uniform areas as well. Methods are ZIP and PIZ, with ZIP better suited for clean renderings with large uniform areas, and PIZ better suited for photographs with noise in them. Picturenaut does apply compression, although the success is very much depending on the image content. Most softare understands this well, and if you open your HDR from Picturenaut in Photoshop or Photomatix, everything should be as you'd expect. Radiance HDR basically always is assumed to be in linear sRGB space. Very similar to color management and profiles for LDR images, there is a standard for how to interpret the RGB values in a file. My assumption would be, that easyHDR doesn't apply the right color primaries when it imports the Radiance HDR. All I know is that easyHDR was designed to be a closed all-in-one program, HDR import/export have been added very late in the game. That's why it doesn't appear on the Software Link list on this page. I can't really speak for easyHDR, because I have never tested it. Thanks in advance for any sugesstions, recommendations and advices. One way or another, I’m used to print my photos in photo lab, so some small mistakes in color accuracy are often massively overruled by color displacement caused by applied printing technology. Are there really visible differences between HDR pictures processed in Radiance HDR and OpenEXR? Or I probably won’t see any significant changes in color rendering? So, I have an older mainstream LCD, time to time calibrated with EyeOne colorimeter, but nothing special these days. I’m not professional photographer, just an enthusiast. There are many interesting HDR programs, but some of them don’t support OpenEXR till now. Go to OpenEXR or Radiance HDR?, that is the question. So, does it mean that Radiance HDR may be as much inaccurate? Or there are so many possible and different representations of RGBE data? And then, how is it with portability of Radiance HDR between different HDR programs? I have to generate HDR file in easyHDR from the beginning to obtain good data for tone mapping. At present, I’m not able to import Picturenaut HDR picture into the easyHDR without troubles. Perhaps it is a native feature of easyHDR software rather than failure of the Radiance format. Unfortunately, the easyHDR doesn’t support OpenEXR format, and I’m not really sure that it would be a cure. the “easyHDR” makes my pictures very greeny. I found that some applications are displaying identical HDR pictures with dramatic color cast. I tried to open Radiance HDR generated by Picturenaut in another HDR programs. double sized in comparison with the Radiance HDR one.ĭoes it mean that EXR is saved w/o any compression in Picturenaut? But when I generated HDR image in Picturenaut and saved it in both formats, the EXR file was approx. to HDRI Handbook, the OpenEXR files should be smaller than Radiance HDRs. I have some questions regarding OpenEXR and Radiance HDR.Īcc. I’m just reading the HDRI Handbook (Czech edition) and playing with Picturenaut and some other HDR tools.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |