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quantifies how much detail an image can convey

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30
votes
5answers
38k views

Is there a general formula for image size vs. print size?

What size images do I need for common print sizes, such as wallet size, 8x10, and 16x20? Is there a general formula? How could that size change if, for example, a 16x20 was printed on canvas rather ...
23
votes
5answers
2k views

Is there any practical difference between saving at 300ppi or 72ppi?

I often see statements in discussions about web displayed image quality that go something like this: "I only upload pictures at 72 dpi and 1200 pixels on the long edge, so if someone copies and prints ...
21
votes
4answers
6k views

CSI image resolution enhance: How real is it?

So I watched the following 1 minute long Youtube clip from CSI New York. In the clip, using what seems to be the recording from a standard bank camera, they zoom in at least 100, and see the image ...
17
votes
4answers
1k views

Does it give higher quality to shoot in low-res mode in-camera, or to downsize high-res photos later?

Suppose you want to store your photos at some lower resolution, let's say about ~1 MB large. You own a camera able to make photos at 5 MPix and more. And, you want to have the maximum quality at the ...
15
votes
10answers
8k views

How many “MegaPixels” can the human eye see?

There is obviously a limit to what the human body can process, such as frames per second. My question is how many MegaPixels would it take before the human eye can no longer differentiate it from ...
14
votes
6answers
2k views

What megapixel value is equivalent to which ISO film?

Is there some kind of equivalency table or formula that expresses what kind of pixels you need in a digital camera to have roughly the same quality as a particular ISO graded film? What other ...
14
votes
3answers
4k views

What is the Nyquist Limit and what is its significance to photographers?

The Nyquist Limit is frequently mentioned in the context of lens and sensor resolution. What is it and what is its significance to photographers? Here is an example of it being used by DPReview.com ...
12
votes
3answers
763 views

How can a high resolution camera matter when the output is low resolution?

The question is inspired by this question showing these pictures. The accepted answer suggests that these pictures were taken by a 8x10 view camera, and the use of a 8x10 camera was confirmed in the ...
12
votes
4answers
3k views

Why are effective pixels greater than the actual resolution?

This page compares Canon EOS 550D and Canon EOS 500D cameras and mentions 18.7 million effective pixels for 550D. However the best resolution possible using this camera is 5184 * 3456 = ...
11
votes
8answers
57k views

How does 18 megapixels compare to 12 megapixels? [duplicate]

I'm purchasing a digital camera & it says, "Effective pixels: Approx. 18.00 Megapixels". What is this compared to 12.00 megapixels?
11
votes
8answers
879 views

Which software could I use for periodic bulk image resizing?

I have a very large collection of images in a bunch of nested folders. I would like to run some sort of process (on a regular basis) that will sync all the images to another place in a new smaller ...
11
votes
3answers
1k views

Is it true that '80s 35mm photofilm had quality corresponding to 24 megapixels?

Is it true that '80s 35mm photofilm had quality corresponding to 24 megapixels? Somebody told me so today, and I find it surprising.
11
votes
3answers
1k views

Does shooting at lower RAW resolution using crop sensor camera mimics qualities of full frame cameras?

I'm not talking about changes to the focal length. I've read many post that say in full frame camera the pixel density is lower compared to crop sensor camera's and so it captures more light and has ...
11
votes
5answers
2k views

How does taking lower-resolution pictures with a higher-resolution sensor affect image quality?

Does taking a picture with 8 megapixel resolution with my Canon IXUS with a 1/2.3" sensor and 12M max resolution provides the same or worse image quality (particular, noise) as if the picture was ...
9
votes
3answers
2k views

Does change of lens affect a camera's megapixels?

I have a Nikon D40. It has only 6.1 MP. I am planning to buy additional lens for it. Can changing the lens of the camera increase or decrease the megapixels of the camera?
9
votes
2answers
903 views

How do I choose which resolution (megapixel) and compression (normal, fine, superfine) to shoot in?

What do I lose if I do not shoot at maximum res? or the "superfine" setting? What are the disadvantages? I would like to learn how digital cameras save in lower resolutions jpegs. Is the extra ...
9
votes
1answer
842 views

Can the slant edge SFR method measure lens resolution greater than the Nyquist limit for the camera sensor?

The slant edge SFR method has become the standard for measuring resolution of lenses and camera systems. It works by scanning a five degree slanted edge to calculate a line spread function. This is ...
8
votes
5answers
366 views

Why does viewfinder spec state 3 times more dots than there are pixels?

My DMC-G2 has a viewfinder spec of 1,440,000 dots, but I read a review that says it is really 480,000 pixels: The electronic viewfinder has an extremely high resolution of 1,440,000 dots (480,000 ...
7
votes
4answers
2k views

Why are two pictures that are the same dimensions/dpi such different file sizes?

I am working on a project where two my images must be AS SMALL AS POSSIBLE. I have scaled two images to the same dimensions/dpi and I've checked the color profile in Photoshop CS6 and they both look ...
7
votes
5answers
23k views

What is a suitable image resolution for canvas prints?

I would like to create a 60 inch x 20 inch canvas print using an image with a resolution of 4759x1798 (240 pixels per inch) and I would like to know if the image quality will still be good at that ...
7
votes
6answers
16k views

Is it possible to increase the pixel density of an image?

I have taken a picture whose resolution is less. I can resize the image easily (i.e I can scale to higher resolution) but the image quality goes for a toss, which is true because the image might not ...
7
votes
3answers
854 views

Is it worth investing in a used 35 mm Film camera?

I've a Canon 60D and I'm mainly interested in shooting landscapes. I feel very interested in buying a used canon EOS film camera (since my EF lenses are compatible). I would like to take pictures ...
7
votes
2answers
211 views

What does it mean to excite aliases?

I recently came across the phrase 'excited aliases.' The phrase seems to be related to lens sharpness in some way. While a web search turns up the phrase a few times, I am unable to locate a decent ...
7
votes
2answers
1k views

Can a video camera produce a high quality still photo shoot?

I have a high-end digital video camera able to output a higher number of megapixels than my digital photo camera. This is true only when using the camera to take stills. Is there anything that's going ...
7
votes
1answer
511 views

Comparing 1:1 zoom on a 27“ screen at 2560 x 1440 vs 22” screen at 1680 x 1050

When using Adobe Photoshop or Lightroom for example, and zooming the photo at 1:1 ratio, when you work on a 22" screen at 1680 x 1050, there is an great inside zoom. On such a screen the pixel are ...
6
votes
4answers
552 views

Using and earning money images from a 10yr old 5MP camera

My camera is from about 2001 and rather limited by today's standards. 5 megapixel, ISO400 at the most, f/8 is the smallest aperture, noise even in good light, a few hot pixels in the CCD, no raw ...
6
votes
4answers
2k views

Are 2 megapixels enough for HD resolution pictures?

HD pictures has 1920x1080 = 2073600 pixels = 2025 kilopixel = 1.98 megapixel. Does this mean that we can take HD pictures with a 2 MP camera? If not, why not?
6
votes
3answers
3k views

What is the difference between image size and image quality?

I have a Casio EX-S12. It has a setting for image size, but also a separate setting for what it calls "image quality". There are three image quality values: "Fine", "Normal", and "Economy". The Casio ...
6
votes
3answers
334 views

Is a low-resolution scan of B&W negatives expected from a drugstore?

Shoot a roll of ilford color process B&W. Take to Walgreens. Receive CD (and negatives). Import to Aperture, crop a bit, and ask for an 8x10. Get a warning that there's not enough pixels to make a ...
6
votes
4answers
953 views

Upscale iPhone taken photograph

I have taken a photo with my iPhone which i would love to use a my website background using jQuery to stretch it dynamically. However its obviously a fairly low resolution. Is there anything i can do ...
6
votes
3answers
386 views

Why is resolution more important for landscape photography?

I have heard countless times that "resolution is of utmost importance for landscape photography". This also comes up often when landscape photographers look to medium format for it's detail and ...
6
votes
3answers
1k views

Is there a photoshop plugin or any other piece of software that can do super resolution?

I want to combine multiple photographs of the same lanscape to increase the resolution of the final image. More details on the method here: http://en.wikipedia.org/wiki/Super-resolution What software ...
5
votes
3answers
856 views

Can film be considered to have infinite resolution as opposed to digital sensors? [duplicate]

Camera sensors have an specific number of cells,and their resolution depends on this amount of cells. But film does not have this "units" of sensible material; So, does the size of the particles of ...
5
votes
3answers
1k views

Image quality when using the same lens on 16Mpix vs 24Mpix

I'm considering buying a new camera and my two candidates are Nikon D7000 and Nikon D7100. I heard that 24Mpix sensor needs very good lens to produce sharp images. Considering that I currently have ...
5
votes
2answers
526 views

Do compact and DSLR cameras have the same sensor size if they have the same number of megapixels?

In the analog camera, I understood the impact of using a 35mm film vs using a 70 mm film. However in digital world, I dont know if the sensor size is the same for compact and DSLRs. In other words, ...
5
votes
1answer
26k views

How can I upscale a low-res image to make it appear higher-res?

I want to enlarge an image to a bigger size. This will cause pixelation. So I want to apply some treatment to it in Photoshop that will suppress some of this pixelation. Of course I cannot generate ...
5
votes
5answers
8k views

What are my options for an FX wide-angle prime to suit the D800's successor? [closed]

I have a D700 which I'm not planning to replace at this point in Nikon's product cycle. I'll porbably buy the D800's successor. Not because I don't like the D800 (especially its usability ...
5
votes
3answers
433 views

For MTF, why does 10 represent contrast while 30 represent resolution?

I'm trying to learn to read MTF charts. Everything is making sense to me, except why most explanations of MTF will refer to the 10 l/mm line as a measure of contrast while referring to the 30 l/mm ...
5
votes
1answer
3k views

What resolution would be needed for a billboard advertisement?

Does anyone know the required resolution for a photograph to be used on a billboard? Would the Canon 7D be able to provide a large enough file size to meet the requirements?
4
votes
5answers
13k views

How to reduce file size without losing quality or resolution?

I have 2,300+ pictures that I want to transfer to my phone but on their original size they take up a lot of space (6.44gb) I would like to trim is down to without sacrificing quality or resolution. I ...
4
votes
3answers
1k views

What are the advantages/disadvantages of sRAW or mRAW files compared to fullsize RAW?

Are there any non-obvious advantages/disadvantages of setting my 7D to use small or medium RAW instead of large? I seldom print pictures, and the way I take photos the sensor is almost never the ...
4
votes
3answers
172 views

Is the megapixel count setting on a P&S digital camera real or a gimmick? [duplicate]

Does downsizing the effective recording megapixel count setting on my P&S digital camera actually decrease the sensor-megapixel density, thereby increasing pixel size and culminating in better ...
4
votes
1answer
883 views

Is it better to edit photos with a high pixel per inch monitor?

Title says it all Is it better to edit photos with a high pixel per inch (PPI) monitor or is a bigger monitor better? eg. My current monitor Panel Size: 23.6“ Wide Screen True Resolution: 1920X1080 ...
4
votes
2answers
648 views

Are cropped images from a full-frame sensor equal quality to full APS-C images despite the lower resolution?

If I put a DX lens on a Nikon D700, it will reduce megapixels to 5.1. I understand that FX pixels are about 2.5 times larger than DX pixels. Would I be correct to assume that, therefore, my FX image ...
4
votes
2answers
3k views

What image dimensions are used for 500px?

The name is 500px.com, but what is the image resolution for which to optimize before uploading your photos there?
4
votes
3answers
280 views

Shooting images smaller than the sensor size

I have a d600 and I appreciate very much the high resolution I get (useful especially for landscapes), but for most other subjects I find 6000 x 4000 to be overkill, making post-processing ...
4
votes
1answer
264 views

Is this article correct about gamma error in picture scaling in common software?

That is kind of a "please proof-read an articles conclusion"-question. Some time ago I found this page: Gamma error in picture scaling. I grasp the point, that the luminosity-curve is not linear and ...
3
votes
5answers
669 views

What is Snapsort's true resolution?

On Snapsort I found this explanation: True resolution Manufacturers advertise high megapixels to sell their cameras, Snapsort calculates the true resolution of each camera based on the ...
3
votes
1answer
4k views

How large an image do I need to print a 32″ by 18″ poster at 300 DPI?

I need to have an image printed as a poster 32″ by 18″ (about 80x45 cm) at 300 DPI, but I am unsure of how big the file must be. Also, what file format is best?
3
votes
2answers
138 views

What resolution should be used for images that are to be used in focus stacking?

I am taking a series of photos using a dSLR camera attached to a microscope that will be used in a stack to produce a single image with high depth of field. Can anyone recommend a level of resolution ...