Resolution
Dec 1, 2011 11:05:18 #
nussmac
Loc: Maryland
How do I increase the resolution of a jpeg? When I try to publish some pictures I get an error message that the resolution is too low. Can I increase it without retaking the picture?
Dec 1, 2011 11:57:10 #
I would chech you camera to see it is set-up at the highest resolution first. Next when you do post processing do you crop in tight. That maybe a problem because that reduce the resolution of a photo too. Depending on the software you are using and how you save your post processed photo can cause a low resolution photo too. I hope this helps, Arnold
Dec 1, 2011 11:58:27 #
nussmac wrote:
That depends. First, what process gave you the error message? If you can be more specific, there may be someone here who has done the same thing, and can offer specific remedies. Were you uploading to a web service? What exact "PUBLISH" process gave you the message? Can I increase it without retaking the picture?
In broad terms, you MAY be able to increase the resolution (Dots Per Inch, or Pixels Per Inch, depending on who you talk to), depending on the quality of the photo to begin with, and depending on what post processing software you have. Again. we'd need to know that in order to give you any assistance.
It's possible that you did a "Save for the Web" or something like that, which takes a normally resolved image and knocks it back to 72 DPI - which is fine for viewing an a computer monitor, but lousy for printing.
Many images come out of the camera at 300 or more DPI, depending on your camera and individual settings - but they are almost all, universally, much higher than 72 DPI. Even the cheapest little $80 P&S from half a dozen years ago shoots out images at 150 DPI.
Dec 1, 2011 12:54:16 #
I don't know what editing software you have but in photoshop to adjust the resolution go to the image menu/image size.
uncheck Resample Image. then lower the resolution ....the smaller the resolution number the larger the picture. For example: if the resolution is at 300 and the photo width is 2x4 when you change that resolution to 150 the photo is now 4x8 inches, etc. To get the best resolution with the largest photo change the resolution to 72. It won't change the photo just the appearance when its enlarged or printed.
uncheck Resample Image. then lower the resolution ....the smaller the resolution number the larger the picture. For example: if the resolution is at 300 and the photo width is 2x4 when you change that resolution to 150 the photo is now 4x8 inches, etc. To get the best resolution with the largest photo change the resolution to 72. It won't change the photo just the appearance when its enlarged or printed.
Dec 2, 2011 14:28:23 #
photogrl57 wrote:
May be great advice but the OP wants to INCREASE resolution, not decrease it.I don't know what editing software you have but in... (show quote)
Dec 2, 2011 15:49:09 #
JimH wrote:
quote=photogrl57 I don't know what editing softwa... (show quote)
My point was .... by decreasing the number it actually increases the resolution of a larger photo. The higher the number the more it pixelates when enlarged which gives the illusion of needing to increase the resolution. It actually works in the opposite way. Google it you will get the same answer I gave.
Dec 2, 2011 21:58:49 #
Paw Paw Bill
Loc: d
Sorry, photogrl57, but you're defiinitely got the wrong google data. Resolution is a measure of how many pixels exist in some particular length (inches, milimeters). The lower the number, the bigger the picture, but the less pixel count per measure. Thus, automatically, lower resolution.
You can resample a photo and have it artifically insert extra pixels (based on interpolation) to increase 'resolution'. It won't add data or increase sharpness.
If you have to provide an image of some particular size in outside dimensions that is less than your original, then you can achieve those dimensions by increasing resolution (higher pixel count/measure) until you shrink your jpg to desired size.
You can resample a photo and have it artifically insert extra pixels (based on interpolation) to increase 'resolution'. It won't add data or increase sharpness.
If you have to provide an image of some particular size in outside dimensions that is less than your original, then you can achieve those dimensions by increasing resolution (higher pixel count/measure) until you shrink your jpg to desired size.
Dec 2, 2011 22:05:47 #
Paw Paw Bill
Loc: d
nussmac wrote:
How do I increase the resolution of a jpeg? When I try to publish some pictures I get an error message that the resolution is too low. Can I increase it without retaking the picture?
Most software can do this. Irfanview is a free program that will do an excellant job.
On any software choose "resize/resample". Set the photo dimensions that you need and select the pixel/measure resolution that you need. 'Measure' in this case will be mm(millimeter), cm(centimeter) or inch(s).
Dec 2, 2011 22:22:09 #
photogrl57 wrote:
the smaller the resolution number the larger the picture. For example: if the resolution is at 300 and the photo width is 2x4 when you change that resolution to 150 the photo is now 4x8 inches, etc. To get the best resolution with the largest photo change the resolution to 72. It won't change the photo just the appearance when its enlarged or printed.
I am confused. You state "if the resolution is at 300 . . ." My question is: 300 what?
Dec 3, 2011 00:31:49 #
Dec 3, 2011 00:37:55 #
photogrl57 wrote:
http://graphicssoft.about.com/cs/resolution/a/increasingres.htm
Not what I asked.
I still want to know "300 what?" 300-dots/inch? 300-pixels/inch?
Dec 3, 2011 00:57:11 #
Dec 3, 2011 01:35:58 #
Dec 3, 2011 02:29:38 #
Nikonian72 wrote:
So, you are claiming that 72-ppi is higher resolution than 300-ppi?
I'm not claiming anything of the kind. He wanted to know how to get his photo to not pixelate when published without retaking it. All I did was suggest he check the image size info. If his resolution was higher than 72 ppi then he could lower that number and it would enlarge the photo capabilities without pixelizing.
It was just one thing to check ... no big deal.
Dec 3, 2011 02:52:56 #
photogrl57 wrote:
I'm not claiming anything of the kind. If his resolution was higher than 72 ppi then he could lower that number and it would enlarge the photo capabilities without pixelizing.
Nikonian72 wrote:
So, you are claiming that 72-ppi is higher resolution than 300-ppi?
I'm not claiming anything of the kind. If his resolution was higher than 72 ppi then he could lower that number and it would enlarge the photo capabilities without pixelizing.
Unfortunately, not true. Just the opposite. The higher pixel count of an image, the greater the enlargement without pixelation.
See: http://en.wikipedia.org/wiki/Pixelation
QUOTE: "In some cases, the resolution of an image or a portion of an image is lowered to introduce pixelation deliberately. This effect is commonly used on television news shows to obscure a person's face or to censor nudity or vulgar gestures, and is also used for artistic effect. This effect is called pixelization."
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