a picture problem for help

Guest · Post by **Guest** » Thu Jun 22, 2006 3:18 pm

i shot some pictures,but the birghtness is dark,then i use xnview to turn it a little bight.But when i save the picture,it became very bad.So,who can tell me how to turn the picture the original.Thanks.

Post by **XnTriq** » Thu Jun 22, 2006 6:20 pm

The link to your photo seems to be broken.
Please upload it to ImageShack.us, Photobucket.com, TinyPic.com or any other hosting site of your choice and try to post it again.

andy0618 · Post by **andy0618** » Fri Jun 23, 2006 6:09 am

sorry,this is the new address.

Post by **xnview** » Fri Jun 23, 2006 7:05 am

andy0618 wrote:sorry,this is the new address.

Which value do you have in option/Write/jpeg/quality??

andy0618 · Post by **andy0618** » Sat Jun 24, 2006 4:24 pm

i click the adjust button,then xnview automaticaly adjust every values.jpg.write.

Post by **XnTriq** » Mon Jun 26, 2006 12:00 am

Hello andy0618

To find out what your JPEG quality settings are go to Tools » Options... » Write » JPEG:

[ Zoom ]

Which version of XnView are you running (Info » About...)? The newest release is v1.82.4 (03 Mar 2006).

To my knowledge, there is unfortunately no way to completely reverse-engineer or undo changes made to a photo, especially when saved in JPEG format, because JPEG compression by definition is a lossy process.

I would suggest that you first determine if the original file can be recovered (= un-deleted/un-erased) from the memory card of the camera the picture was taken with.
It's a Sony Cyber-shot DSC-P73, so we are dealing with Memory Stick or Memory Stick Pro, which is supported by most data rescue programs.

If recovery isn't an option or if it doesn't succeed you can try to reduce the artifacts (壓縮比率與不自然痕跡) on the altered/over-compressed image.

To get a sense of the original image quality I extracted the embedded low-res thumbnail with Jhead (jhead.exe -st "th_&i" dsc03037.jpg):

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DataRescue: PhotoRescue – data-recovery solution for digital photography
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Jasc/Corel: Paint Shop Pro
- Tutorial: JPEG Artifact Removal Fig.#1
  When an image is saved in .jpg format, compression is used to reduce the file size. If the compression level is too high, artifacts occur in the saved image. Artifacts take on several forms in images, but generally they can be described as a “blotchy look”. Artifacts can often give the appearance of color leakage at the edges of objects in the image. People using digital cameras, who use high compression, will likely find themselves using this feature a lot. In this tutorial we will focus on using the JPEG Artifact Removal feature to improve an image that contains artifacts.
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Topaz Labs: DeJPEG (Freeware)
A Photoshop plug-in that removes JPEG artifacts and enhances image clarity simultaneously. Its ease of use makes it perfect for everyone while its advanced algorithms achieve the optimal result.
- Tutorial: What is JPEG Artifacts and How to Remove Them? Fig.#2

Figure #1:

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Figure #2:

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Post by **XnTriq** » Fri Jun 30, 2006 2:10 am

<!--
@ Moderators:

Would someone please edit this post to something like...

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sorry,this is the new address.

[url=http://i65.photobucket.com/albums/h205/andy0618/DSC03037.jpg]
[img]http://s65.photobucket.com/albums/h205/andy0618/th_DSC03037.jpg[/img]
[/url]

..., because the large image breaks the thread's layout.

Thank you.
// -->[/i][/color]

Dreamer · Post by **Dreamer** » Fri Jun 30, 2006 3:17 pm

Done.

Post by **XnTriq** » Fri Jun 30, 2006 3:40 pm

Dreamer wrote:Done.

Thanks a lot, Dreamer! You da man