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Author Topic: What is the purpose of the Leaf Prophoto RGB profile?  (Read 1762 times)
yaya
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« Reply #20 on: December 19, 2013, 01:02:00 AM »
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Actually Andrew from an end user standpoint, when you look at the Base Characteristics tool in Capture One and click on the drop-down Profile menu, all you see is "Profoto RGB", reducing the chance of any confusion...
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tho_mas
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« Reply #21 on: December 19, 2013, 04:36:39 AM »
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But ProPhoto RGB is not an input profile.
Correct.
ProPhotoRGB is a matrix based profile with defined primaries (TRC, WP ...).

The "LeafLF3-ProPhoto RGB.icm" (same as the "LeafLF2-ProPhoto RGB.icm") is a table based input profile. It also shows different primaries.
(see attachments)

__________

Of course I don't know in detail but basically it goes like this...:

At the first stage the RAW files in C1 get transformed from non-linear data into linear data and get converted into C1's internal color space (which is huge).
This pre-transformation takes place under the hood and is basically the same as in any other RAW software.

In the user interface there is a tool where you can select a "camera profile". These user-selectable profiles are assigned to the (pre-transformed) RAW files and they do apply a look. They also provide a neutral gray axis (mostly Gamma 1.8 ). So these "Camera Profiles" in Capture One are designed as "camera specific working spaces"... if you want to say so.

The "LeafLF3-ProPhoto RGB.icm" profile is designed to assign a very neutral and pretty flat look to the files (actually it applies "no look" and leaves the creation of a specific look to the end user). As a "camera profile" in C1 it provides an optimal starting point for further editing in ProPhoto-RGB (which you can choose as target when processing). That's all.

So since the "Leaf-ProPhoto.icm" is NOT ProPhoto-RGB it is very good not to call it "ProPhoto".
Since it's desigend as a specific starting point for further editing in ProPhoto it is usefull to call it "Leaf ProPhoto".


« Last Edit: December 19, 2013, 04:47:18 AM by tho_mas » Logged
digitaldog
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« Reply #22 on: December 19, 2013, 09:19:00 AM »
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Actually Andrew from an end user standpoint, when you look at the Base Characteristics tool in Capture One and click on the drop-down Profile menu, all you see is "Profoto RGB", reducing the chance of any confusion...

But that profile named (externally) LeafLF2/3-Prophoto RGB.icm?
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Andrew Rodney
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digitaldog
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« Reply #23 on: December 19, 2013, 09:28:02 AM »
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The "LeafLF3-ProPhoto RGB.icm" (same as the "LeafLF2-ProPhoto RGB.icm") is a table based input profile. It also shows different primaries.
(see attachments)
Then we are back to my rant (I fully admit it) that this profile has no reason to have ProPhoto in the name! Bad Leaf, bad Leaf!

Look Leaf (or whoever is responsible <g>):
There's only one ProPhoto RGB color space. You alter anything in the profile, change the chromaticity a decimal point, it is no longer ProPhoto RGB and you (Leaf) should not use that name in part or otherwise. Period. This appears to be a marketing based decision as there is zero technical reason to call anything ProPhoto RGB but ProPhoto RGB.

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At the first stage the RAW files in C1 get transformed from non-linear data into linear data and get converted into C1's internal color space (which is huge).
I'd expect that from all raw converters. In Adobe raw converters, that space has no name (good dog Adobe) but uses ProPhoto primaries and a 1.0 TRC. Adobe didn't call it Adobe-ProPhoto RGB, they actually have a clue about color management, they put it on the map in 1998 and introduced most to the idea of an RGB working space. They did kind of screw up SMPTE-240M but then got to call it Adobe RGB (1998) understanding you don't alter an existing defined working space and use the same name or append that name somehow.

Quote
The "LeafLF3-ProPhoto RGB.icm" profile is designed to assign a very neutral and pretty flat look to the files (actually it applies "no look" and leaves the creation of a specific look to the end user). As a "camera profile" in C1 it provides an optimal starting point for further editing in ProPhoto-RGB (which you can choose as target when processing). That's all.
It isn't PhotoRGB right? It therefore should have no reference to ProPhoto RGB. Just call the damn thing "LeafLF3-RGB.icm". WTF are they thinking?
Quote
So since the "Leaf-ProPhoto.icm" is NOT ProPhoto-RGB it is very good not to call it "ProPhoto".
Amen to that! Bad dog Leaf, bad dog.
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Andrew Rodney
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tho_mas
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« Reply #24 on: December 19, 2013, 09:49:18 AM »
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It isn't PhotoRGB right? It therefore should have no reference to ProPhoto RGB. Just call the damn thing "LeafLF3-RGB.icm". WTF are they thinking?
you are right.
They should have called it: "LeafinputprofilespecificallyaimedatProPhotoRGBworkflowbutwithoutanynamesothatstupidusersdontconfuseitwithanythingelse.icm"
That would have been much easier.
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digitaldog
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« Reply #25 on: December 19, 2013, 09:51:13 AM »
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you are right.
They should have called it: "LeafinputprofilespecificallyaimedatProPhotoRGBworkflowbutwithoutanynamesothatstupiduseresdontconfuseitwithoutanythingelse.icm"
That would have been much easier.
I'd probably stick to a 32 character name including extension but you're getting there!
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Andrew Rodney
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