Sunset in Kruger

by MrFrench

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8,001 reputation
1938
bio website bitdepth.thomasrutter.com
location Australia
age 34
visits member for 4 years, 3 months
seen Apr 14 at 1:57

Apr
13
revised Are 2 megapixels enough for HD resolution pictures?
added 31 characters in body
Apr
10
comment Why do RAW images look worse than JPEGs in editing programs?
The gamma correction is what throws away most of that additional bit depth, and that is necessary when displaying on any screen, so once you've locked in the exposure, white point, contrast curve, etc and you apply that transform, your added bit depth is gone - however you can preserve it somewhat by using a 16 bits per channel (or better) output image format and ensuring the whole thing is done in that precision, which will allow you some more manipulation in smooth areas such as sky without introducing banding.
Mar
19
comment How can I add a border to a JPEG photo without affecting quality?
Could that particular discrepancy be with the chroma subsampling mode used? "Use quality settings from original image" also sets chroma subsampling to match original, not just Q. Though you may already be doing that.
Mar
19
comment How can I add a border to a JPEG photo without affecting quality?
Well that's interesting. Is it a local maximum? How far up the quality scale until the PSNR is higher than the sameQ result? Is it higher at Q 41? Q 39? Or does it take more eg Q 50?
Mar
19
comment How can I add a border to a JPEG photo without affecting quality?
"changing the quality setting (even upwards!) usually leads to considerable quantization losses". This will not happen, it's not how quantization works, unfortunately many sources imply or outright claim this to be the case. Do testing with PSNR or SSIM or some other common metric showing this to be the case (changing quality upwards results in poorer quality than equal quantizers) and I will stand corrected, but basically it's not true.
Mar
19
comment How can I add a border to a JPEG photo without affecting quality?
That description is incorrect; the only way to minimise the losses in quantization is to reduce quantization; re-saving with a very high quality (low quantization) will be a lot more effective at approaching the same quality as the source, than re-saving with the same quantizers as last time. There is a lot of misinformation about this feature on the web and people think it is a magical way of improving quality.
Mar
19
comment How can I add a border to a JPEG photo without affecting quality?
This answer misunderstands what the "Use quality settings from original image" setting does. This does not attempt to best preserve a re-encoded image, but to apply roughly the same degradation (same quantizers) to the image as was applied last time. After re-saving, the image will be roughly twice as degraded as the original, having been degraded a second time by the same amount as the first time it was saved. This setting is not useful for preserving quality; only if you want to save bytes re-compressing an image that was already pretty degraded and you don't mind.
Mar
11
revised Why do images get “corrupted”?
added 158 characters in body
Jan
24
awarded  Yearling
Dec
16
comment Should I store unedited/raw, edited, or watermarked images while backing up on DVD/CD?
Good answer. I would prioritise these by saying #3 is top priority, and #1 and #2 are equal second.
Nov
11
awarded  Nice Answer
Oct
13
answered Missing photos on a roll of film?
Oct
13
revised How does iResolution on Panasonic Lumix DMC-GM1 (Micro Four Thirds) work?
added 14 characters in body
Oct
13
answered How does iResolution on Panasonic Lumix DMC-GM1 (Micro Four Thirds) work?
Oct
11
comment Why am I getting black photos when I use the Manual feature on my Nikon D5100?
I've modified my answer a bit to make it, IMHO, more helpful and gentle. Do you like it better now?
Oct
11
revised Why am I getting black photos when I use the Manual feature on my Nikon D5100?
added 53 characters in body
Oct
7
revised What's the difference between a regular lens and a macro lens?
deleted 58 characters in body
Sep
30
awarded  Explainer
Sep
27
comment What are the pros and cons of setting my camera to lock exposure on half press?
I assumed cameras that didn't have physical AE-L buttons wouldn't have the setting about whether to lock exposure on half press, but it looks like I'm wrong here?
Sep
26
answered What are the pros and cons of setting my camera to lock exposure on half press?