Exposure compensation in Photoshop?

Started Jul 13, 2003 | Discussion
Derekasaurus Rex
Senior MemberPosts: 2,914
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Exposure compensation in Photoshop?
Jul 13, 2003

The way I usually perform exposure adjustments in Photoshop is to duplicate the layer in "Screen" blend mode and set the opacity to 33% for +1/3 EV, 50% for +1/2, 66% for +2/3, etc. For negative adjustments I use "Multiply"mode.

I was wondering what techniques others had for adjusting exposure in Photoshop?

A problem with my method is that it won't work with 16-bit images because it requires layers, so I'm interested in methods that work with 16-bit images.

TonyK_in_Texas
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Re: Exposure compensation in Photoshop?
In reply to Derekasaurus Rex, Jul 13, 2003

I do my EC in C1LE these days.

I like your method though and will have to keep it in mind.

Thanks,

Derekasaurus Rex wrote:

The way I usually perform exposure adjustments in Photoshop is to
duplicate the layer in "Screen" blend mode and set the opacity to
33% for +1/3 EV, 50% for +1/2, 66% for +2/3, etc. For negative
adjustments I use "Multiply"mode.

I was wondering what techniques others had for adjusting exposure
in Photoshop?

A problem with my method is that it won't work with 16-bit images
because it requires layers, so I'm interested in methods that work
with 16-bit images.

--
TonyK

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Greg M
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Re: Exposure compensation in Photoshop?
In reply to Derekasaurus Rex, Jul 13, 2003

I'd sugest shooting in RAW and doing your exposure adjustment when you convert the image to a 16 bit tif file. It would be better and probably just as quick as what you are doing. Then you would have all of the advantages of shooting in RAW.

--
Greg M
http://www.mocanu.com/gallery/index.php
http://dslr.mocanu.com

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Derekasaurus Rex
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I already shoot RAW
In reply to Greg M, Jul 13, 2003

I shoot exclusively RAW and use BreeseBrowser to perform exposure compensation. However, BB uses a small and fuzzy preview to adjust WB and exposure, so I figured if there it a slick way to do it in PS it might be better. My way is easy (especially with PS actions), but it doesn't work for 16-bit images.

Greg M wrote:

I'd sugest shooting in RAW and doing your exposure adjustment when
you convert the image to a 16 bit tif file. It would be better and
probably just as quick as what you are doing. Then you would have
all of the advantages of shooting in RAW.

--
Greg M
http://www.mocanu.com/gallery/index.php
http://dslr.mocanu.com

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Greg M
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Re: I already shoot RAW
In reply to Derekasaurus Rex, Jul 13, 2003

Give Yarc Plus a try. The preview can be set to high quality and it makes it easy to make your adjustments.

Derekasaurus Rex wrote:
I shoot exclusively RAW and use BreeseBrowser to perform exposure
compensation. However, BB uses a small and fuzzy preview to adjust
WB and exposure, so I figured if there it a slick way to do it in
PS it might be better. My way is easy (especially with PS actions),
but it doesn't work for 16-bit images.

Greg M wrote:

I'd sugest shooting in RAW and doing your exposure adjustment when
you convert the image to a 16 bit tif file. It would be better and
probably just as quick as what you are doing. Then you would have
all of the advantages of shooting in RAW.

--
Greg M
http://www.mocanu.com/gallery/index.php
http://dslr.mocanu.com

--
Greg M
http://www.mocanu.com/gallery/index.php
http://dslr.mocanu.com

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Derekasaurus Rex
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Will do. Thanks. {nt}
In reply to Greg M, Jul 13, 2003

Greg M wrote:
Give Yarc Plus a try. The preview can be set to high quality and
it makes it easy to make your adjustments.

Derekasaurus Rex wrote:
I shoot exclusively RAW and use BreeseBrowser to perform exposure
compensation. However, BB uses a small and fuzzy preview to adjust
WB and exposure, so I figured if there it a slick way to do it in
PS it might be better. My way is easy (especially with PS actions),
but it doesn't work for 16-bit images.

Greg M wrote:

I'd sugest shooting in RAW and doing your exposure adjustment when
you convert the image to a 16 bit tif file. It would be better and
probably just as quick as what you are doing. Then you would have
all of the advantages of shooting in RAW.

--
Greg M
http://www.mocanu.com/gallery/index.php
http://dslr.mocanu.com

--
Greg M
http://www.mocanu.com/gallery/index.php
http://dslr.mocanu.com

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Leo Reinhard
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Re: Exposure compensation in Photoshop?
In reply to Derekasaurus Rex, Jul 13, 2003

Why not download the trial version of C1LE to see if it suits you. You can do a lot of adjustments in 16 bit and output it Tif or jpg. Croppiing is also available. I find their exposure adjustments ( EV + -), contrast, WB, curves, levels and color saturation to be so good that I rarely have to do anything in PS.

Derekasaurus Rex wrote:

The way I usually perform exposure adjustments in Photoshop is to
duplicate the layer in "Screen" blend mode and set the opacity to
33% for +1/3 EV, 50% for +1/2, 66% for +2/3, etc. For negative
adjustments I use "Multiply"mode.

I was wondering what techniques others had for adjusting exposure
in Photoshop?

A problem with my method is that it won't work with 16-bit images
because it requires layers, so I'm interested in methods that work
with 16-bit images.

--
Leo R

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Derekasaurus Rex
Senior MemberPosts: 2,914
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Re: Exposure compensation in Photoshop?
In reply to Leo Reinhard, Jul 13, 2003

I already have the evaluation version of C1LE and it is very good. However, I find Photoshop's adjustment layers invaluable, which is why I prefer to work in PS. Over the past few months I have created all sorts of adjustment layer actions for changing tone, saturation, exposure compensation, etc. This way I can process my entire image without actually altering it and save the PSD. Later if I decide I shouldn't have applied that warming filter, I can just toggle the layer off and be done with it.

Leo Reinhard wrote:

Why not download the trial version of C1LE to see if it suits you.
You can do a lot of adjustments in 16 bit and output it Tif or jpg.
Croppiing is also available. I find their exposure adjustments ( EV
+ -), contrast, WB, curves, levels and color saturation to be so
good that I rarely have to do anything in PS.

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Nill Toulme
Veteran MemberPosts: 8,149
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Is there a way to use this method...
In reply to Derekasaurus Rex, Jul 13, 2003

... on a selection only?

Nill
~~
http://www.toulme.net

Derekasaurus Rex wrote:

The way I usually perform exposure adjustments in Photoshop is to
duplicate the layer in "Screen" blend mode and set the opacity to
33% for +1/3 EV, 50% for +1/2, 66% for +2/3, etc. For negative
adjustments I use "Multiply"mode.

I was wondering what techniques others had for adjusting exposure
in Photoshop?

A problem with my method is that it won't work with 16-bit images
because it requires layers, so I'm interested in methods that work
with 16-bit images.

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Derekasaurus Rex
Senior MemberPosts: 2,914
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Re: Is there a way to use this method...
In reply to Nill Toulme, Jul 14, 2003

You can create a layer mask (Layer-> Add Layer Mask-> Hide All) to the Screen layer. Then you can paint (or fill) the parts of the layer mask white where you want the image's exposure modified. The rest will be untouched.

Nill Toulme wrote:
... on a selection only?

Nill
~~
http://www.toulme.net

Derekasaurus Rex wrote:

The way I usually perform exposure adjustments in Photoshop is to
duplicate the layer in "Screen" blend mode and set the opacity to
33% for +1/3 EV, 50% for +1/2, 66% for +2/3, etc. For negative
adjustments I use "Multiply"mode.

I was wondering what techniques others had for adjusting exposure
in Photoshop?

A problem with my method is that it won't work with 16-bit images
because it requires layers, so I'm interested in methods that work
with 16-bit images.

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Nill Toulme
Veteran MemberPosts: 8,149
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Thanks! (NT)²
In reply to Derekasaurus Rex, Jul 15, 2003

Derekasaurus Rex wrote:
You can create a layer mask (Layer-> Add Layer Mask-> Hide All) to
the Screen layer. Then you can paint (or fill) the parts of the
layer mask white where you want the image's exposure modified. The
rest will be untouched.

Nill Toulme wrote:
... on a selection only?

Nill
~~
http://www.toulme.net

Derekasaurus Rex wrote:

The way I usually perform exposure adjustments in Photoshop is to
duplicate the layer in "Screen" blend mode and set the opacity to
33% for +1/3 EV, 50% for +1/2, 66% for +2/3, etc. For negative
adjustments I use "Multiply"mode.

I was wondering what techniques others had for adjusting exposure
in Photoshop?

A problem with my method is that it won't work with 16-bit images
because it requires layers, so I'm interested in methods that work
with 16-bit images.

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Derekasaurus Rex
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This method is the same as using Curves
In reply to Derekasaurus Rex, Jul 15, 2003

After working through the math it's apparent that this "Screen blend mode" method is identical to applying a quadratic curve using the Curves tool. For example, a 66% opacity Screen layer (+2/3 EV) is basically the same as a Curve with a control point at (128,165). So good old Curves can be used to modify exposure for 16-bit files. Now I hope Adobe gives us 16-bit layers soon...

Derekasaurus Rex wrote:

The way I usually perform exposure adjustments in Photoshop is to
duplicate the layer in "Screen" blend mode and set the opacity to
33% for +1/3 EV, 50% for +1/2, 66% for +2/3, etc. For negative
adjustments I use "Multiply"mode.

I was wondering what techniques others had for adjusting exposure
in Photoshop?

A problem with my method is that it won't work with 16-bit images
because it requires layers, so I'm interested in methods that work
with 16-bit images.

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David Martin
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What are you saving PSD files on?
In reply to Derekasaurus Rex, Jul 15, 2003

Derekasaurus Rex wrote:
I already have the evaluation version of C1LE and it is very good.
However, I find Photoshop's adjustment layers invaluable, which is
why I prefer to work in PS. Over the past few months I have created
all sorts of adjustment layer actions for changing tone,
saturation, exposure compensation, etc. This way I can process my
entire image without actually altering it and save the PSD. Later
if I decide I shouldn't have applied that warming filter, I can
just toggle the layer off and be done with it.

Leo Reinhard wrote:

Why not download the trial version of C1LE to see if it suits you.
You can do a lot of adjustments in 16 bit and output it Tif or jpg.
Croppiing is also available. I find their exposure adjustments ( EV
+ -), contrast, WB, curves, levels and color saturation to be so
good that I rarely have to do anything in PS.

They are so massive I've given up using them, instead I do my adjustments and save as a TIFF.
Are you burning on to DVD or something?
--
Regards,
DaveMart
Please see profile for equipment

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Derekasaurus Rex
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External hard drives and CD
In reply to David Martin, Jul 15, 2003

David Martin wrote:

Derekasaurus Rex wrote:

I already have the evaluation version of C1LE and it is very good.
However, I find Photoshop's adjustment layers invaluable, which is
why I prefer to work in PS. Over the past few months I have created
all sorts of adjustment layer actions for changing tone,
saturation, exposure compensation, etc. This way I can process my
entire image without actually altering it and save the PSD. Later
if I decide I shouldn't have applied that warming filter, I can
just toggle the layer off and be done with it.

They are so massive I've given up using them, instead I do my
adjustments and save as a TIFF.
Are you burning on to DVD or something?

I have large external hard drives (USB2 and FireWire) and I archive to CD. Nothing special.

The files can double in size when I add the Screen layer, which is why I'm going to switching to Curves for exposure compensation (adjustment layers add almost nothing to PSD file size). This puts them just over 30mb a piece. For this reason I sometimes only archive the RAW original to CD and leave the PSD files on external drives. Multiple copies are pretty safe and I can always reproduce them if necessary.

Now that I've discovered the equivalence between my Screen method and applying a Curve, my files sizes should go down to the point where they are very comparable to uncompressed TIFFs.

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David Martin
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I wonder how 'Lightness' equates!
In reply to Derekasaurus Rex, Jul 15, 2003

Derekasaurus Rex wrote:

David Martin wrote:

Derekasaurus Rex wrote:

I already have the evaluation version of C1LE and it is very good.
However, I find Photoshop's adjustment layers invaluable, which is
why I prefer to work in PS. Over the past few months I have created
all sorts of adjustment layer actions for changing tone,
saturation, exposure compensation, etc. This way I can process my
entire image without actually altering it and save the PSD. Later
if I decide I shouldn't have applied that warming filter, I can
just toggle the layer off and be done with it.

They are so massive I've given up using them, instead I do my
adjustments and save as a TIFF.
Are you burning on to DVD or something?

I have large external hard drives (USB2 and FireWire) and I archive
to CD. Nothing special.

The files can double in size when I add the Screen layer, which is
why I'm going to switching to Curves for exposure compensation
(adjustment layers add almost nothing to PSD file size). This puts
them just over 30mb a piece. For this reason I sometimes only
archive the RAW original to CD and leave the PSD files on external
drives. Multiple copies are pretty safe and I can always reproduce
them if necessary.

Now that I've discovered the equivalence between my Screen method
and applying a Curve, my files sizes should go down to the point
where they are very comparable to uncompressed TIFFs.

If that is similar to curves?
--
Regards,
DaveMart
Please see profile for equipment

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Derekasaurus Rex
Senior MemberPosts: 2,914
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Re: I wonder how 'Lightness' equates!
In reply to David Martin, Jul 15, 2003

David Martin wrote:
(snip)

Now that I've discovered the equivalence between my Screen method
and applying a Curve, my files sizes should go down to the point
where they are very comparable to uncompressed TIFFs.

If that is similar to curves?

What exactly do you mean by Lightness? I only know that term in the context of Photoshop with respect to Lab color mode.

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Milind Rao
Regular MemberPosts: 164
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Re: Exposure compensation in Photoshop?
In reply to Derekasaurus Rex, Jul 15, 2003

After reading this excellent article,
http://www.gurusnetwork.com/tutorials/photoshop/curves1.html

I use curves for exposure compensation.

--

Regards
Milind

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Derekasaurus Rex
Senior MemberPosts: 2,914
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Great tutorial! Thanks! {nt}
In reply to Milind Rao, Jul 15, 2003

Milind Rao wrote:

After reading this excellent article,
http://www.gurusnetwork.com/tutorials/photoshop/curves1.html

I use curves for exposure compensation.

--

Regards
Milind

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hounwai
Junior MemberPosts: 32
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Re: Thanks for sharing! (nt)
In reply to Milind Rao, Jul 15, 2003

Milind Rao wrote:

After reading this excellent article,
http://www.gurusnetwork.com/tutorials/photoshop/curves1.html

I use curves for exposure compensation.

--

Regards
Milind

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Greg M
Veteran MemberPosts: 4,220
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I'll second that (nt)
In reply to hounwai, Jul 15, 2003

hounwai wrote:

Milind Rao wrote:

After reading this excellent article,
http://www.gurusnetwork.com/tutorials/photoshop/curves1.html

I use curves for exposure compensation.

--

Regards
Milind

--
Greg M
http://www.mocanu.com/gallery/index.php
http://dslr.mocanu.com

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