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95,140 reputation
4198351
bio website mattgrum.com
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visits member for 4 years, 3 months
seen 14 hours ago

Dec
8
comment What can cause blurry and out of focus images on a Nikon D5300 in no flash mode?
@user1032613 yes but I bet the blur was completely linear, this blur has a definite curvature to it which would indicate either a) it took place over a much longer period of time, or b) the boat was moving about incredibly violently to create a change in direction within 0.00125 seconds (probably to the extent to which nobody would even be attempting to take a photograph)
Dec
8
comment What can cause blurry and out of focus images on a Nikon D5300 in no flash mode?
@user1032613 I can't.
Dec
3
comment What is the benefit of a wide-aperture lens if you stop it down?
I don't have time to dig out lens test and try and equate them between brands but there are plenty of 50mm f/1.4 lenses that aren't amazing at f/1.8 or f/2 and would easily be beaten by something like the Sony/Zeiss FE 55 f/1.8 or the Leica AA 50 f/2 wide open. Likewise many ultrafast lenses f/1 or f/0.95 aren't great one stop down compared to the best f/1.4 lenses.
Nov
28
comment Photography editing style and secret
There is indeed a secret setting hidden away on all cameras that instantly makes all your images look exactly like Elizabeth's (including the horses), but I'm not allowed to tell you what it is, you have to discover it for yourself.
Nov
27
comment Deciding between two lenses
@user1899082 that image was taken with a 12mm (ultra-ultra-wide) lens and then cropped to prevent converging verticals, you wont quite be able to get that dramatic a perspective using a 24mm, nor will you be able to have the building's edges parallel to the edge of the image. See: photo.stackexchange.com/questions/1100/…
Nov
26
comment How can slightly blurred photos be improved in post processing?
@clabacchio that's exactly what I say in the answer, the images demonstrate the theory, not the practice.
Nov
26
comment Is saving money buying a tripod with only 1.5kg payload false economy?
Never in the course of human history has the following phrase been uttered "man, I really wish I'd bought a cheaper tripod" ;)
Nov
26
comment How can slightly blurred photos be improved in post processing?
@clabacchio done, for now, will need to rehost these in the long term...
Nov
21
comment How is this effect created in Photoshop?
Push the colour temperature and fill light sliders all the way up in lightroom (or google HDR tutorial).
Nov
13
comment What is a “crisp” photo?
It is just a loose synonym for sharp.
Nov
13
comment How to estimate camera sensor size?
@alasin are you sure the focal length figure you have isn't in millimeters? I've never heard of it being specified in pixels before.
Nov
12
comment How to estimate camera sensor size?
There's nothing you can do if you only have the focal length in pixels. If you have the focal length in mm then you can measure the angle of view and calculate the sensor size in mm very easily.
Nov
3
comment Seeking a way for “authoritiative”, proven method to prove that two photo images are “nearly identical”?
@AndyBlankertz yes PSNR scores are meaningful in isolation - unlike the MAE the error is expressed relative to the signal.
Nov
3
comment Seeking a way for “authoritiative”, proven method to prove that two photo images are “nearly identical”?
@DVK PSNR is not insensitive to scaling, I know of no standard metric that is. So the short answer to your question would be "no". There is SIFT (scale invariant feature transform) that works for image features (lines, corners etc.) but not entire images. You could come up with a way of converting images into SIFT features and then comparing the features, but then it wouldn't be a widely accepted method, as you would have just invented it.
Oct
31
comment Does it make sense to “Expose to the Right” except at base ISO?
@Pedr With a 5D mkIII the best performance is achieved by getting as much light in as you can (by opening the aperture/using a slower shutter), and then pushing up the ISO as high as you can (without overexposing any important areas of the image).
Oct
31
comment Does simply opening and closing a JPEG file decrease image quality?
@SteveCox I opened an image in Photoshop, saved it as a JPEG quality 7, opened that JPEG and saved it as a JPEG quality 7, then repeated 5 times. I then compared the first JPEG to the 5th JPEG. What the reference implementation does is only of academic interest if the major editors all cause a decrease in quality.
Oct
31
comment Does simply opening and closing a JPEG file decrease image quality?
-1 Just done a quick experiment with Photoshop CC and repeatedly opening and saving an image with exactly the same settings does result in a different file each time, when compared to the original using a "difference" blending mode. Apparently Photoshop is not an "worth its salt". I can't speak for other editors but I'd bet money they are the same. You could write a program very carefully to avoid rounding errors when continually decompressing and recompressing an image, but there would be no point - JPEGs are not a good intermediate format, full stop.
Oct
31
comment How can I give an assitant rights to edit without having the possibility to download the image?
This question appears to be off-topic because it is about computer security and not photography.
Oct
31
comment Why is there no image noise in my webcam dark frame photographs?
It's probably nothing more complicated than clipping the blacks to a level greater than the noise. I highly doubt the manufacturers of the webcam developed a processor that would recognize a frame that contained only noise and process it differently.
Oct
28
comment Why Isn't This Photograph Pin Sharp?
@IliahBorg I don't use DOF calculators either, I use live view at maximum magnification centred on the most distant detail I want to capture and starting at infinity bring the focus forwards as far as possible until it just starts to degrade.