DPP doesn't have a genuine Exposure control?

First I must say I am not a DPP user, never installed it. But in other forum someone provided images processed with DPP, the original and the resulting from adjusting 'Bright' and 'Exposure', and I analyzed the before vs after to obtain the curves (level arrangements) that produced the output from the input.

I already did this for ACR and Photoshop Exposure, Bright, Contrast,... in this article, and everything was as expected (the Exposure control is a straight line curve starting from (0,0) both in ACR and Photoshop, a genuine Exposure correction).

But in DPP it doesn't happen like that.

Brightness in DPP (in the RGB tab): +/-50

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• What DPP calls Bright, is like the old Bright control in Photoshop CS2, a totally unrecommended adjustment since it destroys highlights information and washes the shadows when pushed, and clips the shadows when reduced
  
• What DPP calls Exposure (Bright in the RAW tab), is a curve like Bright in ACR and Photoshop CS3 and above, and is not a genuine Exposure adjustment
  
• A genuine Exposure adjustement in DPP simply doesn't exist (!!!)
  

Interesting. Can you post the link to that forum. Thanks. I'm going to feel dumb saying this but I have never seen an exposure adjustment in DPP. Is it that curves type adjustment? I just watched a DPP tutorial about the tool pallet and they state that curve adjustment is for brightness and contrast. I must have missed something.

digital paradise wrote in post #12928017
Interesting. Can you post the link to that forum. Thanks. I'm going to feel dumb saying this but I have never seen an exposure adjustment in DPP. Is it that curves type adjustment? I just watched a DPP tutorial about the tool pallet and they state that curve adjustment is for brightness and contrast. I must have missed something.

Nope, you didn't miss anything. There is no Exposure adjustment in DPP.

Or I'm also missing something..

The Brightness slider at the top of the RAW tab is scaled in EV units and is generally referred to as the exposure adjustment. Positive exposure adjustment can also be done by dragging the right margin of the RAW histogram to the left. The dotted vertical lines in the histogram are also EV units.

I'm not at home at the moment to check this, but I'm not sure Guillaume has this right. It's not the way I remember DPP working. Apparently he was sent files from DPP by somebody who said they were Exposure adjustments, but we don't know exactly what he received and how exactly they were made. I will look at it in a couple hours.

tzalman wrote in post #12928289
The Brightness slider at the top of the RAW tab is scaled in EV units and is generally referred to as the exposure adjustment.

That is what I thought.

I'm not at home at the moment to check this, but I'm not sure Guillaume has this right. It's not the way I remember DPP working. Apparently he was sent files from DPP by somebody who said they were Exposure adjustments, but we don't know exactly what he received and how exactly they were made. I will look at it in a couple hours.

Sounds good.

tkerr wrote in post #12928081
Nope, you didn't miss anything. There is no Exposure adjustment in DPP.

Or I'm also missing something..

Thanks. I looked on every tab and could not find it.

digital paradise wrote in post #12928456
Thanks. I looked on every tab and could not find it.

So did I, and I have the most recent DPP V 3.10.2.0 which was just release a couple days ago.

Sorry for the wrong naming convention, as I said I am not a DPP user. Correct, 'Exposure' is the 'Bright' setting in the RAW tab.

And here is the original article with the source images from which the curves were calculated.

tzalman wrote in post #12928289
Positive exposure adjustment can also be done by dragging the right margin of the RAW histogram to the left. The dotted vertical lines in the histogram are also EV units.

I am pretty sure THIS is the genuine Exposure adjustment. If you could post a before/after couple of images I can calculate the curves, that should be a straight line passing by (0,0).

So in DPP it would be:
- Bright in the RGB tab: a tool to forget about
- Bright in the RAW tab: what is normally considered (ACR, Photoshop) the Brightnes setting. A soft curve passing by (0,0) and (255,255).
- The dotted line: genuine exposure setting. A straight line passing by (0,0). But can it be set to the right?

Regards

So you just need two Jpegs of any type?

Below are three screen captures of DPP. In the first RAW Brightness (Exposure) is at default 0, in the second it is raised +1 EV and in the third it is -1 EV. To the left is the RAW tab and to the right the RGB tab with its predictive histogram. As can clearly be seen the adjustment is linear and both the white point and the black point are shifted to the right or the left.

+1 EV using the margin dragging method:

tzalman wrote in post #12929340
Below are three screen captures of DPP. In the first RAW Brightness (Exposure) is at default 0, in the second it is raised +1 EV and in the third it is -1 EV. To the left is the RAW tab and to the right the RGB tab with its predictive histogram. As can clearly be seen the adjustment is linear and both the white point and the black point are shifted to the right or the left.

Thanks

digital paradise wrote in post #12928892
So you just need two Jpegs of any type?

I need the JPEG output with ALL possible DPP parameters set to 0 (or neutral, if some of them have another scale), no matter how dull the image results, and then a second JPEG where just the parameter under study has changed with respect to the initial settings.

The image should contain as many levels as possible in all three channels. Any landscape full of subjects would be OK.

Thanks

tzalman wrote in post #12929340
Below are three screen captures of DPP. In the first RAW Brightness (Exposure) is at default 0, in the second it is raised +1 EV and in the third it is -1 EV. To the left is the RAW tab and to the right the RGB tab with its predictive histogram. As can clearly be seen the adjustment is linear and both the white point and the black point are shifted to the right or the left.

The transformations you applied are far from linear tzalman, this is the curve that models the +1EV:

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I guess it doesn't surprise me that it's not linear, although I'm not up on all the science of things.

I wonder what results you would see if you opened a Raw file and then in the Raw tab switched to the Linear mode?