Exporting to 300 DPI Jpgs?

DR
Posted By
Daniel_R_J_Cook
Nov 17, 2006
Views
1928
Replies
6
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Closed
I cannot find anywhere how I save JPG’s at a 300 DPI resolution.

If I adjust the image resolution to 300 DPI, it still saves as 72 DPI JPG.

Any ideas? Thanks.

ps. I was half expecting the adobe side of the forums to be the same as the macromedia side – dissapointing, the adobe forums make my head explode.
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P
Phosphor
Nov 17, 2006
Why do you need to specify a resolution?

How are you going to be using this 300 Ppi image?

Praise be to the Flying Spaghetti Monster that these forums aren’t based on the same sludgy Flash-n-FuseTalk framework used for the [former] Macromedia Forums. You must have not been around when we stirred up the bonfire and roasted those forums alive. They’re abominably un-user-friendly.
BL
Bob Levine
Nov 17, 2006
If I adjust the image resolution to 300 DPI, it still saves as 72 DPI JPG.

According to what?

BTW, I feel the same way about the MM forums. I guess it’s just a matter of what you’re used to. You can use these forums with a newsreader…just point it to adobeforums.com. But please turn off the autoquote in the newsreader if you do.

Bob
M
Mousewrites
Nov 17, 2006
Hi,

Well, nothing is wrong, per se, with your jpgs. The way that jpgs save data means that it will always save at 72 ppi; it will change your image size to reflect the change of ppi. You won’t lose pixels, but it will set the ppi to 72.

Example: 1×1 inch image at 144ppi as a jpg will be 2×2 inches at 72 ppi.

To get around this, you generaly save as a different format, such as tiff or psd.

I second the above poster; why use a 300 ppi jpg anyway? A browser would display it at 72, anyway (in almost all cases).

Note: I have seen (rarely) jpgs higher than 72 ppi, but not out of photoshop, (mebby jpg2000’s, but I can’t find any documentation on that), and I can’t tell you how to make them.
P
Phosphor
Nov 17, 2006
JPEGs don’t have a "native" resolution.

The only values that matter are the absolute number of pixels for width and height. The PPI resolution value would be attached only as a function of its use in an application.
DP
Daryl_Pritchard
Nov 17, 2006
In Photoshop, if you use "Save As…" to save a JPG, the tagged resolution is saved as part of the EXIF data, and when you open that image in PS, the Image Size dialog will report the resolution as per that EXIF data. On the other hand, saving a JPG via "Save for Web" will strip out the EXIF data, yielding an image reported as being at 72 ppi when opened.

One reason for saving 300ppi JPG is to keep file sizes smaller than a TIF or PSD would provide, even if a high quality JPEG compression is used. The TIF/PSD original should still alo be saved for future editing, but the JPG may be more useful and desirable for uploading to online print services.

Regards,

Daryl
DR
Daniel_R_J_Cook
Nov 24, 2006
Thanks Daryl,

Sorry for late reply, I had trouble finding the thread, should have ticked Subscribe!

I must have not done ‘saved as’ correctly before, because I just tried changing a jpg to 300 DPI and save as JPG and it worked!

And Daryl is right about the requirement for a 300 DPI JPG, I send them via email for print. Also when I create brochures, a folder of 20 x JPGs at 300 DPI is considerably less in size than 20 x TIF at 300 DPI.

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