Questions tagged [dpi]

Dots per inch, where a dot is the smallest imaging element in an output medium (droplet of ink, for example, or subpixel in an LCD screen).

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52 votes
7 answers
189k 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 ...
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78 votes
6 answers
60k views

How do I generate high quality prints with an ink jet printer?

Creating high-quality photo prints using an ink jet printer is no trivial matter. Depending on the tonal range and color depth desired and the expected viewing platform, how you approach printing may ...
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35 votes
8 answers
28k 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 ...
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22 votes
6 answers
6k views

Does the dpi number reported by camera in JPG have any meaning?

I have two cameras, a 6mpix Panasonic FZ8, and 14mpix Canon A2200. When I compare shots from two cameras, one of differences I notice is dpi number that camera reports in JPG info: FZ8 reports dpi=...
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15 votes
2 answers
40k views

What does DPI mean?

What does DPI mean and how does it affect images displayed on screen versus printed?
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9 votes
2 answers
9k views

What DPI should I resize my image to for best printing quality?

And my apologies if this sounds a bit too basic but I can't get my head around this. I have a digital image I took with my camera. 4000x3000 pixels, and GIMP claims that its resolution is 72x72 DPI. ...
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3 votes
2 answers
1k 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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2 votes
4 answers
7k views

Does bumping DPI improve the print quality?

I am about to publish a book and after uplaod the contents, I was notified various errors esp about the images that were less than 300 DPI (115 dpi, 150 dpi, 200 dpi). I was told that they can can ...
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1 vote
1 answer
426 views

DPI in photos vs DPI in Printers/Scanners [duplicate]

When I look at the properties of a JPEG shot on my Canon 5D MkIII (set to the highest quality settings on the camera), i've noticed that the 'Horizontal/Vertical Resolution is 72 DPI' My only ...
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1 vote
5 answers
1k views

How does PPI relate to DPI in photo metadata?

I have been asked to provide pictures in JPEG format at a resolution of 300DPI. My computer give me a picture sizes in kilobytes and Photoscape the photo editing package that I use, converts ...
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1 vote
3 answers
7k views

How does the dpi setting affect the image exported from Lightroom [duplicate]

If I export an image from Lightroom (as a jpeg) I can specify to resize it to particular dimensions, or keep it as it is. But regardless of that there is also a dimension field as in dots per inch but ...
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1 vote
5 answers
2k views

How does optimizer software reduce file size without reducing resolution?

There are numerous applications for reducing filesize. Most of them reduce resolution (e.g. from 300dpi to 72dpi) or reduce height and width. I tried http://www.imageoptimizer.net/ Surprisingly, when ...
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13 votes
5 answers
12k views

What are the minimum DPI and size (in pixels) required to print good 10x15 photos?

I have canon 400D. my photos (jpgs) are usually from about 3.5 MB to 6 MB (3888 x 2592 in pixels). How can I resize them to get good 10cmx15cm photos & faster upload?
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  • 233
8 votes
1 answer
4k views

How do I make my image comply with the requirements of this photography competition?

I am participating in a photography competition. There is something that I want to ask you about: We may require the originals of the awarded photographs to be submitted by the relevant ...
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4 votes
1 answer
21k 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?
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-1 votes
2 answers
1k 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?
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