Started by sgwrx, September 16, 2017, 12:41:06 am
Quote from: sgwrx on September 16, 2017, 09:37:13 pmto answer my own question - since 0-255 is the best we can do in computers and displays and such, i think the biggest benefit of HDR images is first noise suppression in lower tones and then the ability to make an HDR type image that squeezes in the 0-255 that we have on our computers.
Quote from: shadowblade on September 18, 2017, 01:01:35 amThere are two aspects of dynamic range at play here - input and ouput.
Quote from: Wayne Fox on September 17, 2017, 01:39:23 pmThe low noise in shadows is the reason it has higher dynamic range Such a sensor means more extreme contrast conditions can be captured and still record usable information that can later be manipulated back into useful output.An extreme example, single shot CMOS IQ3 100. Exposed so the sun itself wouldn't clip to maintain the color information in it. the IQ180 wasn't too bad as long as you were at base ISO, but I don't know if it could have pulled this off. Which other sensors could have also pulled it off? not sure, but probably several of the more modern Sony sensors. unmodified RAW then processed final image.
Quote from: sgwrx on September 20, 2017, 11:55:27 pmoh, one more question - this is why a lot or most HDR photos look horrible huh?
Quote from: sgwrx on September 20, 2017, 11:55:27 pmoh, one more question - this is why a lot or most HDR photos look horrible huh? because we expect that "outside" would be blown out white if you are taking an interior photo during the day. but we see an exterior which is similar in brightness to the interior and that looks wanky.typically, i will leave my exterior in that case, overly bright, but with enough detail and color to see what's out there. i do this also in my 3d renders.
Quote from: shadowblade on September 21, 2017, 05:27:39 amThat's due to bad tonemapping, not HDR.Every digital photo - HDR or not - is tonemapped. The thing is, with a standard exposure, the RAW converter applies a default tonemapping curve for you, subject to a limited number of manual controls. With an HDR image, you need to set the curve yourself. This gives you more opportunity to screw it up. You can screw up a non-HDR file just as easily if you import it into tonemapping software and apply a bad curve.
Quote from: sgwrx on September 24, 2017, 01:50:00 pmnice! so this is where i started to conclude that the main benefit must be in single capture noise. but now i'm even questioning that. see the thing is, you can take an hdr image with any camera, it really boils down to how many exposures (1 or multiple) and what type of post processing or in camera processing there is. also, what is closest to what our eye's see i suppose. and again, at least on a computer monitor, it all boils down to what can you compress into 0 and 255 (in each of the colors) and still display. but who knows. everything is just better about the sony image to me.
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