How do I produce a photo that's 300 dpi?

Question

I have taken one photo that's 2031x2803 pixels and was told that it's only 72dpi. Do I need a course in dpi and pixels?

Answer 1

You have discovered one of the biggest confusions in digital photography - resolution!

Here's my 'simple' explanation:

Resolution is how many pixels are there, period! So the resolution of the pic you took is 2031x2803, about 5.7 megapixels.

Digicams just record pixels. It's up to us how we spread them out (pixels density - ppi).

(Note: technically, Dots per Inch (dpi) is really about dots of ink in inkjet printers. But the term dpi is often used to mean ppi.)

But the JPEG picture standard requires a specification for pixel density. So the camera has to put "something" into the pixel density spec. It can be any number the manufacturer chooses.

Most digicam manufacturers chose 72 pixels per inch (ppi). It really does not matter because we can change it to anything we want.

If you look at the Image Size of your pic in photo-editing software, it will tell you that the image is about 28.2 inches by 38.9 inches at 72 ppi. (Who wants that!)

If you change the pixel density to 300 ppi, the image size will be about 6.8 by 9.3 inches.

These are the same 5.7 megapixels your camera captured. Nothing changed except the specified pixel density.

Now back to your question. To produce a pic with 300 ppi, take one with high enough resolution to get the print size you want. You did that with your 5.7 megapixel image (as long as you do not want to print bigger than 6.8 x 9.3 inches).

Then either use photo-editing software to change the pixel density to 300 ppi, or else set the print output size to 6.8 x 9.3 inches and let the printer software compute the ppi for you.

If you want 300 ppi exactly for other print sizes, you can tell photo-editing software the image size in inches, the pixel density you want (300), and check 'Resample'. The software will go through your image and either add or discard pixels to make it come out exactly 300. This works well when discarding pixels, but can degrade quality when adding too many pixels.

But you do not have to hit 300 ppi exactly. Most newer printers work well in a wide range around 300 ppi. So you can specify the print size you want (within reason), and get good results.

The 5.7 MB image you have can easily yield high quality 8x10, and maybe 11x14.

Good Luck

Answer 2

300 Dpi Image

Answer 3

300 Dpi To Pixels

Answer 4

OK.... I am an artist so Ill do my best at the math..
DPI is Dots Per Inch. so if your picture above is 2031 pixels across at 72 dpi.. thats 2031 dots per inch, when an in equals 72 pixels...
so the above will be 28.20 inches by 38.93 inches at 72 DPI.
Now....
You can make this a higher resolution by going smaller, but keeping the ratio the same, and keep the clarity from becoming what we call "lossy", meaning losing its definition and clarity.
so, if ya shrink that in half, you get a picture that is 14 x 19.32 @ 144 dpi...
Meaning you would have to make it 1/4 of the size to get to 300 dpi, ( 7x9) Roughly, at 288 dpi.
Hope this helps

Answer 5

Pixels is a photography term and dpi (dots per inch) is a printing term. I have no idea how pixel measurement relates to inches. The information might be in a digital photography text. Have you looked in the owners manual to see if it has the answer?

Answer 6

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