shooting Jpeg Large-Fine with 10D

[Fuzzleak]

When I shoot with the highest setting on Jpeg with the 10D, I thought you would get a approx. 6.3 mega pixel picture, but after uploading it then view it on my computer and move my mouse over the jpeg picture, it says it is approx. 2.4 or sometimes less mega pixel, why does this happen or do you lose pixels when uploading it to your computer ?

[hawg]

6.3 mega pixel is resolution. 2.4 mega bytes is the file size. two different measurements

[Fuzzleak]

Thanks Hawg...On that note, if I make corrections with a photo program, (each time I edit the picture)the file size does drop (at times in the Kb range), but will it remain at 6.3 meg resolution? I've heard raw files won't face this problem.

[hawg]

yes, that's true. But be careful when opening jpeg files, the file might degrade everytime you open it. Jpeg format tries to compress the file each time you save it causing loss in quality.

As a precaution I burn most images I want to keep on CD before any extensive editing. That way I always have an original.

[mwinog2777]

hawg wrote:
yes, that's true. But be careful when opening jpeg files, the file might degrade everytime you open it. Jpeg format tries to compress the file each time you save it causing loss in quality.

As a precaution I burn most images I want to keep on CD before any extensive editing. That way I always have an original.

Above noted; that's why shooting in RAW and working in TIFF has become the accepted standard for quality 10D photography.

[defordphoto]

hawg wrote:
yes, that's true. But be careful when opening jpeg files, the file might degrade everytime you open it. Jpeg format tries to compress the file each time you save it causing loss in quality.

As a precaution I burn most images I want to keep on CD before any extensive editing. That way I always have an original.

Actually that is not true. The file only degrades if you re-save it as a JPEG. Save it as a TIFF and you'll NEVER lose ANY quality from the original shot. The photo does not degrade when you open it, only when you re-save and recompress it as JPEG.

And yes, whether JPEG or RAW or TIF, always keep the orginal.

[scottbergerphoto]

RFMSports wrote:
hawg wrote:
yes, that's true. But be careful when opening jpeg files, the file might degrade everytime you open it. Jpeg format tries to compress the file each time you save it causing loss in quality.

As a precaution I burn most images I want to keep on CD before any extensive editing. That way I always have an original.

Actually that is not true. The file only degrades if you re-save it as a JPEG. Save it as a TIFF and you'll NEVER lose ANY quality from the original shot. The photo does not degrade when you open it, only when you re-save and recompress it as JPEG.

And yes, whether JPEG or RAW or TIF, always keep the orginal.
Absoloutely Right! Even when shooting JPEG, you should convert the image to Tiff. Jpegs lose data each time you edit and resave, while Tiff's do not. There is a nice article about this on Roger Cavanaugh's site. Also you should read the following thread: http://photography-on-the.net/forum/viewtopic.php?Topic ID=9380/.
Scott