In general, we recommend using CHDK DNG.
Thank you. I used dcraw for RAW->TIFF conversion earlier.Will camera work slower if it will save DNG instead RAW ?
As far as I understand, it should convert each pixel by color profile.
I tried some software and learned more about DNG, so, lets continue.I'm trying to choose between DNG and CRW format for use with CHDK. Please correct me if I'm wrong somewhere.
DNG can contains badpixel info, but RAW cannot. Desktop software can use DNG built-in badpixel info for correct output image. For CRW, desktop software can use non built-in badpixel file. So, result of DNG and CRW conversion can be the same.
Camera color profile is more complex thing. As far as I understand, not DNG nor the RAW contain color profile, i.e. processing depends on desktop software.
The important part of choosing DNG/CRW - what software I need for convert DNG/CRW to well-known image formats like PNG, using badpixel info and color profiles. For my purpose, I need multiplatform software(preferable open-source) with ability to batch conversion. I.e. Photoshop and other Windows/Mac is not usable.
P.S. I read http://chdk.wikia.com/wiki/Badpixel_removal, but could you confirm: as far as I understand, "badpixel file" used only for camera-side badpixels removing, but "badpixel.bin file" used only for desktop-side camera pixels removing.
CHDK DNG do contain a color matrix, but the quality varies between ports and there no simple, documented process to make a good calibration (dng4ps2 can be used for this, but in practice it is difficult or impossible to get it to work on current cameras). If you come up with a better calibration, we can include it in the source.
Split from http://chdk.setepontos.com/index.php?topic=390.msg122873#msg122873Quote from: alex73 on 10 / June / 2015, 16:25:45Thank you. I used dcraw for RAW->TIFF conversion earlier.Will camera work slower if it will save DNG instead RAW ?It's a little bit slower, something like 100-200ms on most cameras.QuoteAs far as I understand, it should convert each pixel by color profile.No, DNG is a raw format, so it saves the original data, plus the information needed for raw software to convert it.I understand your project is using PTP controlled shooting. In this case, if you can use the "remote shoot" function to shoot and download in one step without saving to the SD card. In this case, there should be essentially no performance difference between DNG and CRW.
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