Saving JPEG without loss

JPEG is a lossy format.

If you open, edit, and save a JPEG, it loses a little quality each time.

• Every time you use the "save as" function, the JPEG quality degrades slightly.

• You may save a jpeg many times w/in a single editing session without loss.

• For editing, work in TIFF, BMP, or PNG format.

• For long-term hard-drive storage, keep a TIFF, BMP, or PNG copy.

• You may copy/paste the file icon to duplicate a JPEG file without loss.

If you must save the file many times, save it in another format ~ BMP, TIFF, PNG ~ for the intermediate sessions. Only save it as a JPEG for the final edit.

Improving Resolution and Enlarging Image (PhotoShop):

First change resolution, then enlarge. Uncheck 'resample' and change resolution (suggested: 300 res). Save and close. Re-open file and change size. You can enlarge up to a point, but watch for degradation of image. Zoom in and look everything over. Print a copy to test it.

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To determine high-resolution PRINT SIZE:

Take the required print dimension in inches and multiply by 300 to get the necessary pixel dimension.

Example to find necessary pixel width:

 If  10" x 8" print size is needed: 10" x 300 = 3000px width needed.

• If 5" x 7" print size is needed: 5" x 300 = 1500px width needed.
• An image file with a pixel width of 400px will produce a tiny print of about 1.3 inches.
• An image file with a pixel width of 2100px will produce a 7" wide print.

 Likewise, divide pixel width by 300 to figure out high-res print size:

• 3000px divided by 300 = 10" wide print (at high res).