Questions tagged [pixels]

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65 views

How to smooth out a pixelated image before printing? [closed]

I have a bunch of images such as this one that are completely pixelated, and I my friend wants to make large prints to hang in her house. How can I smooth these out so they will not appear pixelated? ...
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4answers
347 views

Since larger pixels increase depth of field and sensitivity, why don't we have large sensors with a low number of pixels?

If I understood correctly, the DoF (all other parameters fixed) increases with the pixel surface. So to have a high sensitivity together with a deep DoF, why don't we just have big pixels (and thus ...
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1answer
48 views

How to calculate Sensor Pixel Pitch?

I need to compute the “Sensor Pixel Pitch (in mm/px)” for some calculation. I have the following data available from the manufacturer: Resolution: 1920x1200 Sensor Type: 2/3” CMOS Pixel size: 4.8 x ...
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2answers
96 views

Does taking pictures with my iPhone 8's camera meet the required specifications for designing a book cover?

I am wanting to send some pictures to my cover designer I plan on taking with my iPhone's camera. Smashword's requirements are listed here. I can't take a photo and then expand it, which could cause ...
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4answers
344 views

Does higher resolution in an image imply more bits per pixel?

I have been trying to understand how a better spectrum of color can be represented in an image and to avoid banding it sounds like the image would need to have more bits per pixel. When the resolution ...
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4answers
156 views

Pixels and photodiodes

A photodiode is the smallest element of a digital sensor, while a pixel is the smallest piece of information in a digital image. I wonder if the two terms can be used interchangeably or there are some ...
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2answers
92 views

poor image quality [closed]

I have a photo that has been edited in google photos or the generic option in photos on an andriod now it looks like a weird design on my bare skin that is green and my bf swears its a tattoo and it's ...
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1answer
72 views

How can I convert a stack of images with increasing intensity to a scale that will let humans see the difference in intensity?

I have a plethora of tiff stacks from a camera with a CCD attached, I am observing the increase in the intensity of my image stack over a change in concentration, the problem that I am having is that ...
2
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1answer
236 views

Large difference between number of image sensor pixels and pixels in the image from my iPhone

According to the specifications given by Apple, the iPhone 5s camera has 8 megapixels. I assume that this is supposed to mean that the image sensor has 8 million photosites, and I would appreciate it ...
4
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2answers
159 views

Effective pixel readout pattern [closed]

Now there are many consumer level camera can shoot high-frame rate video. However, there is sacrificing of effective pixels as the frame rate increase. Here I'm going to take SONY RX10M3 as example. ...
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1answer
113 views

What happens when pixels cover almost all the area of the sensor?

I think, in this question, one who give an answer has to consider 'pixel size vs pixel pitch'. I read that in some sensors, pixels don't cover the whole sensor and my question is, when the pixels ...
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1answer
812 views

Can we calculate object distances by changing camera position and “measuring” pixel sizes of objects

I am not sure if this is a telemetry question or simple geometry but came across to similar questions in this forum, but I think this is a bit different; and actually "simpler" (compared to "autofocus"...
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1answer
343 views

(compression artefacts) Pixelated photo, using Canon EOS T6 dslr

So I bought the Canon EOS rebel T6 to take pictures of products and the result is not clean as I expected. See below a picture crudely cropped for space requierement of this site. I took this picture ...
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3answers
1k views

What are these purple pixels on my Canon 60D and how do I get rid of them?

I bought this used Canon 60D for a reasonable price, however, I get these purple pixels in the top right of my image. Even though I can work around it, it is very annoying. I've tried a lot of ways to ...
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2answers
60 views

Podcast Cover Art Help! [closed]

My Photographer Shot in Raw with 885 × 1024 dimensions. I need this for a podcast cover at 1,400 x 1400 pixels -3,000 x 3000. Please help?
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1answer
48 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 ...
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1answer
168 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 ...
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2answers
694 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? ...
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3answers
943 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 ...
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2answers
106 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 ...
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2answers
2k 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 ...
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1answer
2k 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
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3answers
594 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 ? - ? ...
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4answers
275 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 ...
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2answers
385 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 ...
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1answer
259 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 ...
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2answers
445 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.
3
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1answer
964 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
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1answer
695 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
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1answer
489 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 ...
8
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2answers
4k 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
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2answers
772 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 ...
2
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3answers
517 views

What is “Resolution” and how is it related to “Printing”?

What do we mean by "Image Resolution", and how is it related to printing on paper? Is resolution related to displaying the image on computer screens too? What is the meaning of "High Resolution"? "...
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2answers
8k 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 ...
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3answers
3k 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 ...
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1answer
136 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 ...
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6answers
98k views

Is it possible to 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 ...
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4answers
7k 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 = 17915904 ~...
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4answers
2k 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 ...
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2answers
2k 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 ...
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8answers
10k 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 ...