India Point Park

India Point Park
by matt-ball                

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  • 0 posts edited
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Feb
8
comment How to convert JPEG to RAW in Photoshop or similar?
@MichaelClark the exception is a Sigma camera with a Foveon sensor, it does capture all 3 channels at each pixel location. I'm sure you already knew but simply neglected to mention it :)
Feb
8
comment Does simply opening and closing a JPEG file decrease image quality?
Carl, I would agree with @JamesSnell that this is an edge case - and I've worked on a popular image editor so I have some experience here. When you open a file, it is copied to an in-memory uncompressed version for editing and the original is immediately discarded. This saves memory and gives you the flexibility to use any file format as a source. I've seen software that can do a lossless flip or rotate of a JPEG, but it's a very specialized function. The program you link to is the only editor I've ever seen that extends this feature to general editing.
Feb
8
comment Does simply opening and closing a JPEG file decrease image quality?
Lots of programs can do lossless rotation, by rotating the DCT blocks without decompressing them thus avoiding the lossy compression step. So you can't say that "saving the file triggers both kinds of compression", even if it's true most of the time.
Jan
5
comment Can in-camera JPEG have image quality advantages over (third party software) converted RAW?
@MichaelClark I don't disagree, but you're arguing a point that's opposite to the question. "Third party software" is even mentioned in the title.
Nov
3
comment Does white balance totally correct color shift due to lens glass or coating?
The phenomenon of colors appearing different under different light is called "metamerism". We're going to see more of that now that incandescent lights are being phased out.
Nov
3
comment Why is FF sharper than crop body for the same framing of the same object?
If a 36,000 line pair chart would be resolved by the FF sensor, then would you also agree that a 24,000 line pair chart would be resolved by the APS-C? And that a 37,000 line pair chart would be too much for both of them? The difference between 36K and 24K is only 1.5, not 2.56 or 2.25. (My APS-C cameras are 1.5 crop, so I'm comfortable using either 1.5X or 1.6X for the math)
Oct
30
comment Why is FF sharper than crop body for the same framing of the same object?
Then I still think you're double counting the same effect. The surface details are getting smaller due to the change in magnification required, your change of framing is simply to match the magnification to the scene.
Oct
30
comment Why is FF sharper than crop body for the same framing of the same object?
Is that just a fancy way of saying the DOF gets larger as you get farther away? Does your logic still hold if you're taking a picture of a flat painting?
Oct
30
comment Why is FF sharper than crop body for the same framing of the same object?
I can see how the greater magnification works out, but how does the greater shooting distance affect sharpness? I don't think it's correct to multiply them together.
Oct
27
comment What factors make a lens brighter?
Everything you say is true. There's another factor though, and that's the accuracy of the lens aperture. Just because you set the camera for F/1.8 doesn't mean that's exactly what you'll get.
Oct
23
comment How to keep burnt-out regions from becoming strongly blue and purple in Rawtherapee?
I'd say it's RT, but double-checking with a different raw processor is how to be sure.
Oct
22
comment How to keep burnt-out regions from becoming strongly blue and purple in Rawtherapee?
Looks like a bug to me.
Oct
22
comment resizing a picture
As I see it there are 3 possibilities: 1. The image was downsized at some point; 2. The image is blurry at any size due to focus problems or whatever; 3. The requirements from the calendar company are too strict, because offset printing doesn't require nearly the detail we expect from photo prints. The proper course of action depends on which it is. Unless the original came from a webcam it should be good enough.
Oct
19
comment What is a low pass filter, and does a camera need to have one?
@Ako most of the time it makes little difference. To see moiré in your image you need to have very fine detail in your scene, and a very sharp lens with perfect focus and the right F-stop and no motion blur. Certainly you can find examples, but it's rare. The ability to get away without a filter goes up as the sensor resolution goes up.
Oct
14
comment Why is there the illusion of detail in photographic noise?
We have all learned, through long conditioning, that featureless surfaces are not natural. Noise just tricks your brain.
Oct
12
comment What are the dynamic ranges of commonly available 35mm film?
@osullic doesn't film grain meet the definition of noise?
Oct
9
comment What is the right way to delete all photos from a camera?
@mattdm the implied answer is that you should format the flash. It should be stated explicitly though. P.S. keeping picture settings the same won't make file sizes the same, due to compression which will vary from image to image. P.P.S. this probably should have been an edit to the answer from 2010.
Oct
9
comment What is the right way to delete all photos from a camera?
@MGOwen I have a multi-step process: 1. copy from the card to my picture directory; 2. copy the picture directory to a backup disk; 3. verify the contents of the card against the backup disk to make sure there were no errors in copying; 4. delete the files on the card, double checking to make sure it's really the card.
Oct
9
comment Why do drones capture images that are curved at edges?
This would have been an even better answer with a description of what a fisheye lens is.
Sep
25
comment What low-cost ISO 400 film is good for learning photography?
I would suggest not using film at all. Learning is based on practice, which means taking as many pictures as possible; if you're stopping to load new film all the time, or worrying about how much it's going to cost, you'll be limiting yourself. My own photographic skills went way up when I switched to digital.