Quote:
Originally Posted by chevelle what does the term 'lowlights seem to be clipped' means? pardon my ignorance by i am still learning. |
The darker areas are completely dark - RGB=0,0,0  In a high dynamic range image, the details in the shadows also should be brought up to show what's in there, unless it is pitch dark in those places.
Similarly, the highlights also shouldn't get clipped. For example, RGB channel values per each pixel should not touch the peak values in any particular area so that the area just appear plain white.
So you may think that when you take the individual shots, the most underexposed shot should have some visible details in the highlights areas (instead of pure white) and the most over exposed shot should have something visible in the lowlight areas - No, it is not needed. If you are shooting RAW, the image will have more dynamic range than the LCD screens in cameras or the PC monitors can display. (32 bits per channel per pixel) So there is no need to have a big difference visually in terms of exposure in the individual RAW images. Quote:
Originally Posted by chevelle well i took 3 photos at different EV. it was 0, 2, -2. but i had to reject the third photo as it wasn't aligned properly. so used 0, 2 photos to make hdr. |
Hmm..with only two shots you won't get a nice looking HDR if there is a huge difference in the amount of light falling in various parts of the frame. In outdoors I think you should take at least 4 shots spaced at 2 EVs to get a decent HDR. I don't use the bracketing in my camera since it is only +or- 0.7 EV. I just click 4 or 5 pictures by rotating the exposure dial by two steps. Quote:
Originally Posted by chevelle then i went into detail enhancer and applied following settings
strength - around 65
color saturation - 69
light smoothing - 5
luminosity - 5
micro soothing -25
white clip - 0.13%
black clip - 0.17%
gamma - 1.79 |
Can't comment on these settings because it can vary from picture to picture to produce a neat looking HDR. Don't go by the values, but go by the visual feedback you are getting when you change these values and finalize on it according to your liking. HTH
I trying to turn my attention away from HDR. As per the gurus here, exposure blending is what you need learn and I think it produces more realistic images having good dynamic range.
Last edited by clevermax : 16th September 2009 at 15:50.
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