Exposure Compensation of Raw files

[TonyK_in_Texas]

Its in the BETA version at this time. I grabbed a copy and it does work.

I am still not sold on ARF so I went with BB first. I'll get Yarc+ later. One can never have too many tools or software programs.

I had to underexpose quite a few shots yesterday whilst shooting an
indoor Gymnastics competition. That was the only way I could stand
a chance of freezing the action. I chose to shoot at ISO800 instead
of 1600 to keep the noise down.

I downloaded the eval copy and don't see any exposure compensation
option. Where is it? The help file says it's only available for 1D
and D60 files.

(I'm using with a D30)

--
http://www.jackzucker.com

--
TonyK

 

[Jack A. Zucker]

Thanks for the info Tony!

I'm currently using BB...I'll have to ask Chris if he's planning on offering the exposure compensation feature. One thing I've been enjoying with the D30 is using ISO 1600 to shoot theatre work in available light. When I get my D60, I'm going to miss that mode. What I was thinking was shooting ISO 800 or 1000 and adjusting levels in PS and living with the noise. It sounds like this feature in Yarc+ may really be worthwhile...

I am still not sold on ARF so I went with BB first. I'll get Yarc+
later. One can never have too many tools or software programs.

I had to underexpose quite a few shots yesterday whilst shooting an
indoor Gymnastics competition. That was the only way I could stand
a chance of freezing the action. I chose to shoot at ISO800 instead
of 1600 to keep the noise down.

I downloaded the eval copy and don't see any exposure compensation
option. Where is it? The help file says it's only available for 1D
and D60 files.

(I'm using with a D30)

--
http://www.jackzucker.com

--
TonyK

--
http://www.jackzucker.com

 

[Leo Reinhard]

BB already has the exposure compensation. After you select a photo, click on the raw button and you will see the exposure compensation right under sharpness compensation.

Thanks for the info Tony!

I'm currently using BB...I'll have to ask Chris if he's planning on
offering the exposure compensation feature.

Leo R

 

[Michael Thomas Mitchell]

That is the case for D60 images, but the D30 files don't seem to be supported in 2.3 (final) right now.

This is one reason I have and use BOTH Yarc and BB. In particular, Yarc's "picture-by-picture" is one of its best features. I like that BB's noise reduction can be applied to JPG output, however, wheras ARF can only be applied to TIF files. Sometimes, my workflow just needs the speed offered by JPG files. (Usually, when I'm doing a job in which JPGs must be delivered quickly. Converted or batching TIFs to JPGS, especially a large number, can then be just a cumbersome extra step.)

Both packages are nice reasonably priced. Thanks to Yarc for supporting EV adjustments on the D30.

M

Thanks for the info Tony!

I'm currently using BB...I'll have to ask Chris if he's planning on
offering the exposure compensation feature.

Leo R

 

[Bruce Henderson]

Timo,

Photoshop has that bug, but it is in the middle input slider, not
in the right input slider. The right input slider simply scale
the data linearly (and is accurate). And exposure compensation is
the very same as linear scaling, exactly so.

There are some other nonlinearities in the Canon EC that also
are difficult or impossible to duplicate in a Photoshop action.

I have analyzed the EC done in the Canon SDK (using proprietary tools) for both the 1D and D60 and found that it is quite nonlinear near 0 and 255. When I use Photoshop Levels to do EC, I have found that I end up increased saturation and more apparent shadow noise.

Bruce (www.yarcplus.com)

 

[Joseph Taylor]

Micheal,

Is there a color problem that you know of with using Yarc+ D30 exposure compensation with linear conversion selected? I tried on a few raw images and after running Fred LPbatch on them, the colors were not right. I know it's still beta, but wanted to know if it's a known issue, or maybe something i'm not doing right. I tried the same thing with the new Scott Professional, also in beta, but it gave the correct colors after LPbatch.

Thanks,
Joseph

Does anyone have any opinions as to whether this is preferred over,
say, adjusting Levels?

Thanks
Don
--

Exposure compensation is not something that can be done with a
simple levels adjustment. Having just designed our own EV comp
algorithm in YarcPlus for the D30 and other cameras that do not
have EV Comp available from the SDK, I can tell you that it is a
complex process. It is not something that can be duplicated with
simple adjustments within PS, unless you are making a very small
change.

BTW...Bruce, my partner, wrote the algorithm, not me.

--
Regards,

Michael Tapes
http://www.YarcPlus.com
http://www.michaeltapes.com

 

[MichaelT]

Micheal,
Is there a color problem that you know of with using Yarc+ D30
exposure compensation with linear conversion selected? I tried on
a few raw images and after running Fred LPbatch on them, the colors
were not right. I know it's still beta, but wanted to know if it's
a known issue, or maybe something i'm not doing right. I tried the
same thing with the new Scott Professional, also in beta, but it
gave the correct colors after LPbatch.

Thanks,
Joseph

MichaelT wrote:

We will look into it. If you could send me the RAW file and 2 JPEGS of your results in both, we would know what you are seeing.

Thanks..

[email protected]

--
Regards,

Michael Tapes
http://www.YarcPlus.com
http://www.michaeltapes.com

 

[MichaelT]

Micheal,
Is there a color problem that you know of with using Yarc+ D30
exposure compensation with linear conversion selected? I tried on
a few raw images and after running Fred LPbatch on them, the colors
were not right. I know it's still beta, but wanted to know if it's
a known issue, or maybe something i'm not doing right. I tried the
same thing with the new Scott Professional, also in beta, but it
gave the correct colors after LPbatch.

Thanks,
Joseph

MichaelT wrote:

We will look into it. If you could send me the RAW file and 2 JPEGS
of your results in both, we would know what you are seeing.

Thanks..

[email protected]

--
Regards,

Michael Tapes
http://www.YarcPlus.com
http://www.michaeltapes.com

Joeseph,

The current Exp Comp Algorithm is designed for Non-Linear only. It will be blocked from Linear in the release version for now..sorry for the confusion..

--
Regards,

Michael Tapes
http://www.YarcPlus.com
http://www.michaeltapes.com

 

[Joseph Taylor]

Thanks Michael.

Joseph

Micheal,
Is there a color problem that you know of with using Yarc+ D30
exposure compensation with linear conversion selected? I tried on
a few raw images and after running Fred LPbatch on them, the colors
were not right. I know it's still beta, but wanted to know if it's
a known issue, or maybe something i'm not doing right. I tried the
same thing with the new Scott Professional, also in beta, but it
gave the correct colors after LPbatch.

Thanks,
Joseph

MichaelT wrote:

We will look into it. If you could send me the RAW file and 2 JPEGS
of your results in both, we would know what you are seeing.

Thanks..

[email protected]

--
Regards,

Michael Tapes
http://www.YarcPlus.com
http://www.michaeltapes.com

Joeseph,

The current Exp Comp Algorithm is designed for Non-Linear only. It
will be blocked from Linear in the release version for now..sorry
for the confusion..

--
Regards,

Michael Tapes
http://www.YarcPlus.com
http://www.michaeltapes.com

 

[Timo Autiokari]

i start working with a 16bit tif and do some linear (?)
correction in the levels dialog as long as there is not
too much clipping of the highlights. If this isnt enough
i go to the curves dialog and start raising the mid-value
128 until it looks pleasing to me.

This indeed is a very good and common technique. With a shot taken from a scene that had a very high dynamic range (high contrast) the exposure correction (using the right input slider) is not not enough, one need to bend the curve a little upwards in order to achive good perceptual match on the low range monitors (and prints).

This should prevent loosing too much highlights.

Yes, the tonal range will be compressed in the highlights not completely cut out (and boosted up, expanded, in the dark end) but. However some hue shifts will appear since this is non-linear adjustment.

Changing to 8bit tif happens after all this major adjustments.

Yes, very good desicion but if you have Photoshop 6 or later then you can do much more there in the 16-bit, for typical photo editing (single photo, no text or other inserts) I do everyting in the 16-bit/c mode, then if the image is going to be published on the Web or viewed on PC systems I convert the final 16-bit/c PSD to the nativePC profile, then drop it to 8-bit/c and then save a JPEG version of it.

One other technique to render a high range scene is the density masking, basically a density mask (logarithmic gray mask) is created from the image that is then blurred enough, then the image is scaled up (linearly using the Levels dialog, right input slider) behind that mask. This will result quite the same as if at the shooting time one had put more light power to the shadow areas. From the standpoit of the RGB data this is linear procedure so there will not be hue-shifts and no compression either but due to the blurred mask there can be some edge effects especially if there are sharp edges between shadow areas and directly illuminated areas in the image, playing with the amount of blur of the mask will help here some.

Timo Autiokari http://www.aim-dtp.net

 

[itsallBb2me]

PS 7 has a packaged action for exposure compensation in 1/2 step intervals. Anybody using this?

 

[Timo Autiokari]

PS 7 has a packaged action for exposure
compensation in 1/2 step intervals.

Where? Found nothing on the CD and no exposure comp action in the .atn files on the hard disk either.

Timo Autiokari http://www.aim-dtp.net

 

[JohnM31499]

PS 7 has a packaged action for exposure compensation in 1/2 step
intervals. Anybody using this?

I don't see any packaged action for this & I'm using PS 7??

-John

 

[itsallBb2me]

PS 7 has a packaged action for exposure compensation in 1/2 step
intervals. Anybody using this?

I don't see any packaged action for this & I'm using PS 7??

-John

Open the Actions window (from the Windows menu), then open Basic Processing Actions.atn. The Exp Comp actions are third and fourth on the list.

 

[JohnM31499]

Open the Actions window (from the Windows menu), then open Basic
Processing Actions.atn. The Exp Comp actions are third and fourth
on the list.

Are you sure you're not confusing a default PS action with one of Michael Thomas's excellent actions??

I found an old action on my HD called "basic Processing Actions" & it was one of Michaels actions.

-John

 

[itsallBb2me]

Open the Actions window (from the Windows menu), then open Basic
Processing Actions.atn. The Exp Comp actions are third and fourth
on the list.

Are you sure you're not confusing a default PS action with one of
Michael Thomas's excellent actions??

Probably did. Sorry for the (my) confusion.