Crop Mode Question
Aug 15, 2019 17:28:40 #
crop mode simply truncates the image frame, rather than do that why not use more pixel sites to create each pixel? its all software and could be via firmware update?
Aug 15, 2019 17:32:13 #
therwol
Loc: USA
Crop mode is necessary because lenses designed for crop sensor cameras (Like Nikon DX) cannot cover an entire full frame sensor. The camera only uses pixels within the coverage of those lenses. It has nothing to do with software.
Aug 15, 2019 17:38:05 #
Doyle Thomas wrote:
crop mode simply truncates the image frame, rather than do that why not use more pixel sites to create each pixel? its all software and could be via firmware update?
Not sure what you are asking or where you are going with this ....but, Software is primarily used for pixel enlargement ( ADDING pixels) of existing pixels through AI/mathematical analysis of the cropped image.
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Aug 15, 2019 18:00:32 #
say you have a sensor 2000x2000 and crop/truncate to 500x500 why not use 4 sites to make each pixel?
Aug 15, 2019 18:01:31 #
therwol wrote:
Crop mode is necessary because lenses designed for crop sensor cameras (Like Nikon DX) cannot cover an entire full frame sensor. The camera only uses pixels within the coverage of those lenses. It has nothing to do with software.
Good Point!
Aug 15, 2019 18:06:08 #
Doyle Thomas wrote:
crop mode simply truncates the image frame, rather than do that why not use more pixel sites to create each pixel? its all software and could be via firmware update?
Then the "full frame" will be a different aspect ratio yet.
Are you talking about the crop capability to set the aspect ratio to 3:2, 4:3, etc. in camera?
Setting an aspect ratio crop will always not use a portion of whatever size sensor the camera starts with.
I don't quite understand you question either.
Aug 15, 2019 18:51:06 #
amfoto1
Loc: San Jose, Calif. USA
Doyle Thomas wrote:
say you have a sensor 2000x2000 and crop/truncate to 500x500 why not use 4 sites to make each pixel?
Because then you would only have a lower resolution image that wasn't cropped at all.
Say that 2000x2000 pixel image is on a sensor that physically measures 20mm x 20mm. That's 100 pixels per mm.
Now if you use 4 pixel sites to make each pixel in the image, as you suggest, you get a 500x500 pixel image that's still being made with the same 20mm x 20mm sensor and you'll now only get a resolution of 25 pixels per mm.
So your attempt at a "crop" will have effectively shot yourself in the foot... "thrown away" three quarters of the resolution that the camera has potential of making.
BTW, in-camera crop mode gives the exact same results as simply doing the crop later in post-processing. (There's likely to be some difference because the camera simply "turns off" the same groups of pixel sites every time... while your hand drawn crop in post-processing is unlikely to be anywhere near as accurate or repeatable.)
Aug 15, 2019 19:23:04 #
Doyle Thomas wrote:
crop mode simply truncates the image frame, rather than do that why not use more pixel sites to create each pixel? its all software and could be via firmware update?
Besides using DX lenses you can use the crop mode if you only want the center portion of the image because your lens isn't long enough.
Aug 15, 2019 19:29:14 #
therwol
Loc: USA
BebuLamar wrote:
Besides using DX lenses you can use the crop mode if you only want the center portion of the image because your lens isn't long enough.
If you're going to do that, just crop the photo after the fact.
Aug 15, 2019 19:45:33 #
therwol wrote:
If you're going to do that, just crop the photo after the fact.
That's what I do, no switching formats necessary.
Aug 15, 2019 20:22:42 #
Doyle Thomas wrote:
crop mode simply truncates the image frame, rather than do that why not use more pixel sites to create each pixel? its all software and could be via firmware update?
I think I understand what you mean, but not sure what benefit you are expecting.
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Aug 15, 2019 20:40:16 #
Doyle Thomas wrote:
crop mode simply truncates the image frame, rather than do that why not use more pixel sites to create each pixel? its all software and could be via firmware update?
You don't need a firmware update when you can do that in just about any software that edits raw or raster files - it's called downsampling. This is not the same as cropping for a smaller sensor.
Aug 16, 2019 05:22:32 #
therwol wrote:
If you're going to do that, just crop the photo after the fact.
Actually even when using the DX lenses it's better to crop after the fact too. So really the crop mode isn't needed.
Aug 16, 2019 06:58:38 #
Two photographers stand side by side to capture a landscape. One has a 40 mpx FF, the other has a 20 mpx M43 (two x crop) - both have a 50mm prime attached. Later they review their photos on a computer, and the photographer with the FF decides he prefers the M43 composition, and crops his photo down until it is exactly the same view as the M43 photo.
How many pixels are now left in the FF photo?
I would be grateful for the answer and any explanation.
How many pixels are now left in the FF photo?
I would be grateful for the answer and any explanation.
Aug 16, 2019 08:07:32 #
Understand that a cropped camera (DX) to use the FULL size of the sensor needs DX lenses. FX lenses DO NOT fill the sensor but can be used.
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