quantifies how much detail an image can convey
21
votes
4answers
20k 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 ...
15
votes
4answers
950 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 ...
7
votes
5answers
865 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 ...
11
votes
5answers
1k 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 ...
18
votes
4answers
3k 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 ...
9
votes
3answers
862 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.
5
votes
6answers
7k 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 ...
3
votes
1answer
10k 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 ...
11
votes
4answers
2k 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 = ...
9
votes
2answers
658 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 ...
14
votes
3answers
3k 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 ...
5
votes
3answers
594 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
2k 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 ...
2
votes
1answer
302 views
Resize and sharpen or sharpen and then resize?
Is there a logical reason why one is preferred over the other or it does not make any difference either way?
Edit: I meant resize as in downsizing the image.
10
votes
8answers
40k views
How does 18 megapixels compare to 12 megapixels?
I'm purchasing a digital camera & it says, "Effective pixels: Approx. 18.00 Megapixels".
What is this compared to 12.00 megapixels?
4
votes
3answers
765 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 ...
2
votes
1answer
354 views
Does reducing JPG resolution decrease, increase, or have no effect on image quality?
I'm getting ready to download a bunch of images from microstock photo agency Dreamstime. I'll eventually want most of the images in the 400x300 pixel range for my website when I'm done working with ...
0
votes
1answer
142 views
What is the “Resolution” and how it's related to “Printing”
What do we mean by "Image Resolution" anyway and how it's related to printing on paper?
Is resolution related to displaying the image on computer screens too?
What is the meaning of "High ...
-1
votes
2answers
160 views
How to reduce the image resolution to increase ppi?
Having an photo of 4000x3000 resolution with 240ppi. Is it possible get a resolution of 400x300 resolution but with higher ppi?If possible how to do that?
