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Author
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Topic: exr storage (Read 2197 times)
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armando alva
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hi i want to use .exr format in order to obtain more space to storage in my hard disk. is this possible with this format? i read the papers in ilm site, and i understood that this format can contain all kind of buffers in only one archive .exr. so this is a great advantage. is that true?  thanks |
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lightwolf
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hi i want to use .exr format in order to obtain more space to storage in my hard disk. is this possible with this format? i read the papers in ilm site, and i understood that this format can contain all kind of buffers in only one archive .exr. so this is a great advantage. is that true? thanks Hi Armando, Well, for what is stored within the image file, the file size can be quite small if you use the included compression types. However make sure that all apps you use can actually read the images. Also check on sample images to see if the compression is as good as you expect. OpenEXR has been designed with the highest quality in mind, so the compression is lossless. This in turn means that the compression is not as high as can be obtained using a lossy image compression format (such as JPEG). OpenEXR also stores images with more bits per pixel (needed for HDR images). If you just want to compress normal 8bit (per colour channel) images (most of the stuff out there, including JPEG or TGA) then OpenEXR will not be the right image format for you. Generally, if HD space is of concern... buy a new harddisk  Having said that, if you want to elaborate on your exact problem I might be able to give you more help. Cheers, Mike |
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Optimism is an occupational hazard of programming: feedback is the treatment. (Kent Beck)
- skype: lupus_lux -
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MStetson
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Don't forget you can use the PXR24 compression method which IS lossy. Been awhile since I did any size comparisons, so I'm not 100% sure how much of a space savings there will be. One thing to remember is to only use the buffers you need to, and only the bit depth you need as well. The defaults for exrTrader are setup pretty good already for this.
-Mike
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lightwolf
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Don't forget you can use the PXR24 compression method which IS lossy.
Only to a degree though. PXR24 is lossy if you use 32bit float pixels, since it basically removes the lower 8 bits. It is lossless for 16bit float pixels though. Cheers, Mike |
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Logged
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Optimism is an occupational hazard of programming: feedback is the treatment. (Kent Beck)
- skype: lupus_lux -
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