Comparative a570 raw pics using chdk

I thought some pics showing the difference of the chdk hack would be of use.

All shots were in manual, no flash, awb in auto, iso 100, neutral colors, 3072x2304. The post processing was all done in Picasso, no elements or photoshop

I found as general conclusion that the pics in jpg came out with a bluish tint, and a bluish tint that was hard for me to remove after the fact. The raw "crw" files came out a little gloomier I thought, but they were very easy to make corrections to make the colors come out.

The same perspective was not strictly adhered to but should be pretty close. This first pic is a jpeg, second pic a crw, of a treadway of an old building. Both pics were enhanced through Picasso.

canon's auto white balance is probably the reason they came out with a blue tint! i've found (on an s3is) that the auto wb only works well when using the flash, but then they seem to be somewhat under exposed.. you can see the difference by taking the same scene using all the different wb settings & then one with custom wb.. my 10 cents is that the custom wb pic will give the closest to the actual colors (please judge the out-of-camera pics w/o any pp).. unless you shoot in raw with the hack, in which case any old wb setting will work but you'll have to correct for what you think the correct wb is later!

I took some more pics today, included are the original jpegs and crw's, as well as an attempt in picasso to clean them up. Manual, iso 100 and daylight for lighting option.

first pic crw

must admit though, none of my jpegs come out that blue!! did you try taking the same scene using all the white balance settings including custom (if your camera has)?

That was going to be the next step. I'm going to have to find away to keep pics organized and labeled. Tried but the camera saves the jpeg and crw in folder, it gets confusing after awhile, keeping them all straight.


ps. camera does not have custom... it does have an evaluative mode though.

what does it do to jpegs in auto mode?

michvin wrote in post #5047598
what does it do to jpegs in auto mode?

I think the first pics of door handles are in awb but I'll have to double check. I'm trying to set up an indoor test of all settings, hopefully will get to it soon.

I was going to the grocery store and came upon a coyote walking through a new development. I took some pics in evaluative mode (or custom depending on which menu you look at...no adjustment possible).

The pics themselves are not great.....still finding out what camera can do. The similarities from the ice rink set are still prominent. Crw's look cleaner, jpeg' s still look bluish, and again I'm surprised by the amount of actual picture size is compressed in jpeg. The pics were taken from the same spot no zooming or walking.

coyote crw. Evaluative - custom setting

the evaluative exposure will make the snow look gray unless you use some compensation! the white on the sign in the jpeg looks white enough to me though (well, just a little blue..)!!

I tried a couple of shots of a hockey net on ice, figuring that was about as much white as you could get in a picture.

Same procedure as before, except I ran it first through Picasso and then elements to see what I could do.

Crw - awb

Whats all that white stuff? Did someone paint the asphalt white?

That is really crazy how much the JPG's are cropped right out of the camera! Bizarre. I wonder if my photos from my A720 are suffering the same sort of abuse! I thought about running the CHDK hack just to get the better quality and flexibility of RAW files, but now I'm convinced.

I have wished my 720 would shoot a little wider, so if the JPG's are being cropped in-camera, shooting in RAW would fix me right up. Thanks for the great JPG/RAW comparison! We'll see how it goes.
B.

to be honest, at some point i stopped taking pictures in jpeg completely. Just bough the large card. I figured, that i don't want such a stupid little thing to ruin the shot. Interesting though, my raw files ends with .CR2

Does the A570 have a setting for custom white balance?

briansocal wrote in post #5076615
Whats all that white stuff? Did someone paint the asphalt white?

-I wish the white stuff would go away. It's been here far to long, kinda of winter from hell.

That is really crazy how much the JPG's are cropped right out of the camera! Bizarre. I wonder if my photos from my A720 are suffering the same sort of abuse! I thought about running the CHDK hack just to get the better quality and flexibility of RAW files, but now I'm convinced.

-I never would have thought it either, quite surprising. You can try the experiment for your self. When the hack is installed you can go into the menu and under raw parameters, they have a selection where you can save one raw and one jpeg for each pic. Works well and you can check for yourself. Be forewarned the raw's take up a lot of memory(10mb a pic ) By the way looked at some of your pics the one of the Midway is impressive, I'd love to visit San Diego someday!

michvin wrote in post #5076914
to be honest, at some point i stopped taking pictures in jpeg completely. Just bough the large card. I figured, that i don't want such a stupid little thing to ruin the shot. Interesting though, my raw files ends with .CR2

-I I can see my self going that route, after seeing the results it just doesnt make sense not too.

audiobomber wrote in post #5078223
Does the A570 have a setting for custom white balance?

- Yes, it's called evaluative - custom. According to the manual...for recording with the optimal white balance data memorized in the camera from a white colored object, such as white paper or cloth.

You can set a custom white balance to obtain the optimal setting for the shooting conditions by having the camera evaluate an object, such as piece of white paper or cloth or photo quality grey card that you wish to establish as the standard white color.

Custom white balance for the following situations that are difficult for awb setting.

Macros.
Objects that have monotone color.
Shooting with a particular source of light(such as a vapor lamp).

briansocal wrote in post #5076615
That is really crazy how much the JPG's are cropped right out of the camera! Bizarre. I wonder if my photos from my A720 are suffering the same sort of abuse! I thought about running the CHDK hack just to get the better quality and flexibility of RAW files, but now I'm convinced.

The EXIF data shows he had Digital Zoom enabled. That wouldn't affect RAW shots, but it would "crop" JPEGs, like it's supposed to. Try turning off digital zoom and shooting new comparison shots.

Jon wrote in post #5078488
The EXIF data shows he had Digital Zoom enabled. That wouldn't affect RAW shots, but it would "crop" JPEGs, like it's supposed to. Try turning off digital zoom and shooting new comparison shots.

Did not even cross my mind that that would be the cause !! I'll try some more shots.