| Picture compression qualiti in digital cameras |
by huitzilopochtli |
2006-06-17 12:09:47 |
I have experience with two digital cameras: Cannon IXUS 500 and Panasonic LUMIX DMC-FZ7.
Both cameras have an option to set image compression quality. I don't have IXUS at hand, but Panasonic has three steps (each taking about 1.1Mb, 2.5Mb and 17.8Mb).
I made the following experiment with Panasonic:
1) chosen a book with large pages and small print as a test subject
2) set everything to manual (aperture, shutter and focus)
3) set the distance and zoom so that the text can barely be readable
3) placed the camera on hard surface to minimize movement and rotation between shots
4) took a shot with each quality setting
5) cropped a relatevely small portion of each picure and save that
6) compared the cropped versions
The problem is - there is absolutely no diffrence in efective quality. They all look exactly the same. Ok, not identical since it is practically impossible to get two identical pictures, but the difference is just in random noise (and the camera *did* rotate a bit).
So, what's up with that? Why three settings when there is no difference?
|
|
[ Reply ] |
|
*quality, sorry for the typo. (n/t) | by huitzilopochtli | 2006-06-17 12:10:48 |
|
No visible difference, perhaps. | by Didactylos | 2006-06-17 12:21:07 |
|
The difference may be only when printed... | by RetiQlum2 | 2006-06-17 12:33:08 |
|
Not the best subject if it's jpeg compression. (n/t) | by Jeff_UK | 2006-06-17 12:48:32 |
|
What artifacts does JPEG create? | by Tomo | 2006-06-17 13:16:02 |
|
Google is my friend... | by Tomo | 2006-11-19 12:55:59 |
|
Get a larger card. | by fudje | 2006-06-17 15:41:51 |
|
Text probably isn't the best thing to test on. | by Scirocco | 2006-06-17 13:58:07 |
|
No, the FZx series do TIFF, not RAW. (n/t) | by fudje | 2006-06-17 15:44:15 |
|
If you are doing any immage manipulation | by hieraco | 2006-06-17 14:43:59 |
|
They're different settings on the Panasonic camera | by fudje | 2006-06-17 15:38:21 |
|
Additionally, why is TIFF "second best"? | by fudje | 2006-06-17 15:50:17 |
|
RAW is what comes right off the sensors | by Scirocco | 2006-11-19 12:55:59 |
