When rotating my digital photos I get a command prompt saying that my photo will be permanetly resized and may lower the quality of my picture.
There are several utilities available for multiple platforms that allow "lossless jpeg rotation"… a program like Picasa or ACDsee can handle this task quite nicely.
The only other way to preserve the exact original quality is if you have access to the original RAW image file (or other uncompressed original, such as .TIF) from the camera. Many digital SLR cameras allow this, and some point-and-shoot cameras do, as well. With such a file, you can rotate and perform other actions to the photo in its uncompressed state. So when you save it as a .jpg, it’s the first time it’s being compressed.
Otherwise, simply re-saving a .jpg to an uncompressed format like TIF before rotating will just render the original jpeg artifacts in the .TIF file. In other words, saving a .jpg as a .TIF doesn’t clean it of its "jpegginess". And you still have to save out to .jpg again anyway, so saving to an uncompressed format is a nonsensical extra step that gains you nothing.
So I’d say use Picasa or ACDsee if all you have is .jpgs. If you have access to uncompressed originals, rotate and edit away! You’ll end up with just one compression pass, in your final save-out to .jpg.
February 8th, 2010 at 2:46 am
get some real software
References :
February 8th, 2010 at 3:23 am
Do it in Photoshop and then save it as a new file name, thus preserving the original.
This lowering of the quality happens when every you modify any JPEG in any way. This is perhaps one of the reasons, pros shoot in RAW. The RAW image file is always preserved.
References :
digiPro
February 8th, 2010 at 3:36 am
There are several utilities available for multiple platforms that allow "lossless jpeg rotation"… a program like Picasa or ACDsee can handle this task quite nicely.
The only other way to preserve the exact original quality is if you have access to the original RAW image file (or other uncompressed original, such as .TIF) from the camera. Many digital SLR cameras allow this, and some point-and-shoot cameras do, as well. With such a file, you can rotate and perform other actions to the photo in its uncompressed state. So when you save it as a .jpg, it’s the first time it’s being compressed.
Otherwise, simply re-saving a .jpg to an uncompressed format like TIF before rotating will just render the original jpeg artifacts in the .TIF file. In other words, saving a .jpg as a .TIF doesn’t clean it of its "jpegginess". And you still have to save out to .jpg again anyway, so saving to an uncompressed format is a nonsensical extra step that gains you nothing.
So I’d say use Picasa or ACDsee if all you have is .jpgs. If you have access to uncompressed originals, rotate and edit away! You’ll end up with just one compression pass, in your final save-out to .jpg.
References :