Spring 2012

Spring 2012
by ani

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0
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1answer
32 views

is it possible to retrace back to the values of intensities that have been captured by the digital camera from the image's RGB values?

One can use matlab to know the RGB values's data for all the pixels. But the camera captures the data by measuring intensities at each photodiode. These values are such that they correspond to one out ...
1
vote
1answer
107 views

Full well capacity

As I understood, the full well capacity is the maximum number of charges(photoelectrons) that can be stored in a pixel before a leakage to adjacent pixels and causing problems like blooming. In some ...
2
votes
2answers
664 views

What is this bright squarish pattern that I'm getting in long exposure images?

I took few long exposures of the night sky yesterday. I know about the hot pixels those appear brighter with longer exposures but this seems to be something different. Can anybody tell what it is? ...
1
vote
3answers
273 views

Number of pixels on longest side of email attachment?

First of all, this is a homework question for my photography class. But I have not been able to find the answer anywhere in any of my class materials or through googling. I don't mind doing more ...
1
vote
2answers
83 views

resizing a picture [duplicate]

I entered a charity calendar competition and the picture of my cat won, but when they tried to make it larger to put on their 2016 calendar it wasn't a good enough quality. It was blurred. I was ...
0
votes
2answers
176 views

Pixel size at long distance

is there a formula to calculate the pixel size of a object at long distance? Here is the scenario, I have a very small object 1cm by 1cm at 200m away from my camera. The camera has a resolution of ...
0
votes
1answer
496 views

How do I calculate the actual size of an image from pixels and PPI? [duplicate]

If I have drawn a line-art diagram that is 250px x 350px on a screen with 92.56 PPI (Dell U2414H - 1920 x 1080, 23.8 inch diagonal) - I'm confused as to why, when this image is transferred into ...
2
votes
3answers
223 views

What are the exact pixel values (or ranges) for shadows/midtones/highlights in Lightroom?

In lightroom, different sliders impact different pixel intensities. I'm looking for the exact values (or approximate ranges) of the various levels: blacks: 0 - ? shadows: ? - ? midtones ? - ? ...
1
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4answers
176 views

Increasing Pixels [duplicate]

I am having a company transfer a photo to a 17" x 24" poster board. They said I don't have enough resolution to upsize that much without losing clarity. So when I take a picture how do I dictate how ...
2
votes
2answers
152 views

What is meant by pixels and DPI for photo submissions?

I am submitting a photo for an exhibit. They require a jpeg to be evaluated and then a print, if accepted. The rules indicate "Entries must be in JPEG format sized at 300 dpi on a CD (4” width of ...
1
vote
1answer
204 views

Why do pixels appear when skies are darkened using the graduation in Lightroom?

I use Photoshop to create a panorama from 3-7 photos. Then I export it back into Lightroom. My RAW files are either DNGs or JPEGS when I import into Photoshop. When exported back to Lightroom, when I ...
-2
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2answers
200 views

How to get photos to be under 500 pixels

How do I set my Nikon 5100 to shoot pictures that come out under 500 pixels? I want to upload pictures to my website.
2
votes
1answer
652 views

Why do some people say to use 0.007 mm (approximate pixel size) for the CoC on a Canon 5DM2?

The 5DM2 pixel size is approximate 0.00645mm in size and so some people talk about using 0.007mm as the CoC. I think canon said once they use 0.035mm for DOF charts, full frame normal is 0.033mm, ...
7
votes
1answer
671 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 ...
5
votes
1answer
438 views

How can a newer camera increase ISO while decreasing pixel size?

I am a bit confused as I am considering to upgrade my canon 350D to 600D. The pixel size has reduced from 6.4 microns to 4.3 microns, however, top ISO has increased from 1600 to 6400. How did that ...
6
votes
2answers
2k views

Olympus OM-D developing hot/dead pixels within two weeks of purchase

I recently bought an Olympus OM-D on holiday and took around 2000 photographs in the 2 week period on holiday. On day 12 it developed some white/pink pixels on the sensor. I've emailed Olympus ...
3
votes
2answers
629 views

How to calculate object size dependent on distance?

I shot some images for use in a blog post. With the closeups, I ran into the problem of too low depth of field. Because I only need them for the web, I think that the easiest way to solve it would be ...
1
vote
1answer
255 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 ...
12
votes
2answers
5k views

What is “pixel density”?

Apparently megapixels aren't a good way to measure the camera quality, so some people are referring to a relative measuring system called "pixel density". What specifically is this? What information ...
4
votes
3answers
2k views

What to look for on a DSLR's LCD?

I think the main features of a reflex's LCD are: size resolution (pixels/dots) vari-angle or not So how important is each one of them? Which one is the most important? What number of pixels is ...
2
votes
1answer
131 views

Why changing image format changes the area shown on the LCD screen?

Recording pixels option when set to Large 14M 4320x3240, in Canon PowerShot SX 210 IS, puts black bars on the vertical sides of the screen. The shot is NOT thus fully seen in its LCD screen. Why is ...
9
votes
6answers
69k views

Is it possible to increase scale up an image to increase the the pixel density?

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 ...
14
votes
4answers
6k 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 = ...
6
votes
4answers
1k 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 ...
4
votes
2answers
1k views

How should one deal with 'hot' pixels on Canon T1i, either in-camera on in Aperture?

I recently took quite a few pictures at my brothers wedding, and when going through them in Aperture 3, I noticed a pretty apparent red pixel towards the bottom left of my images. I didn't notice this ...
16
votes
6answers
6k 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 ...