Crop JPEG without decreasing quality

[Nicolas Mittelmaier]

Hi there,

I am looking for a way to remove the white stripes around my scanned
photographs. Cropping a file is not difficult, but when I use XnView for
example the file size increases after saving at almost 100%.

Why is this? I know that saving jpegs over and over, reduces the quality of
the picture, but how can the file size actually increase?

And even more important: How can I crop the jpeg without losing quality? If
this is not possible: How can I crop the jpeg without making the file size
increase?

Thanks for any hints,
Nico

 

[Toke Eskildsen]

Nicolas Mittelmaier wrote:

[Snip Cropping a JPEG and saving at 100%]

Why is this? I know that saving jpegs over and over, reduces the
quality of the picture, but how can the file size actually
increase?

Because it wasn't saved at 100% before.

And even more important: How can I crop the jpeg without losing
quality?

There's a list of such programs at
http://jpegclub.org/losslessapps.html

They all support lossless rotation and some support lossless cropping.

 

[John Inzer]

The simple solution to your scanning problem
would be to only scan the portion of the image
that you wish to keep. Then cropping would
not be required.

On your scanning screen you see a Preview of
the scan...

Try the following...left click / drag a box around
the portion of the image you wish to see in your
completed scan.

To answer your question about losing quality
when you crop...this would apply to all image
editing...

If you save your scans in a lossless format like
..tif or .png...you can edit and save as many times
as you wish.

Read about file formats at the following link:

Digital Image file Types Explained
http://tinyurl.com/7jyd

--

John Inzer
Picture It! MVP
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Picture It! Support Center
http://support.microsoft.com/?pr=pic