John Wheeler
Offline
• • •
Upload & Sell: Off
|
 p.2 #6 · Asus ProArt P16 laptop: Lightroom exported JPG colors discrepancy | |
nibunnoichi wrote:
This begs the question: What is a the definitive & comprehensive list of items/checks/settings/procedures/etc I need provide or follow to constitute, without a shadow of a doubt, admissible in a court of law, agreed-upon by a jury of 12, a "color managed workflow" ?
Because so far, prior to this laptop, my photography workflow (in relation to colors) has been something like:
1) Setting the camera's color space to Adobe RGB
2) Shoot in RAW.
3) Edits in Lightroom in ProPhoto RGB (no choice either way), admittedly on an uncalibrated LCD until now.
4) Exported to Photoshop in ProPhoto RGB
5) Edits in photoshop in the ProPhoto RGB workspace.
6) Exported from Lightroom with output Color Space = sRGB
What else?...Show more →
I hope you did not take my post as offense, and I hope it did not create frustration, as I think you are doing most of the things to have color represented quite well in your workflow.
First, here is a good and pretty easy-to-read tutorial on color management that might be helpful:
https://www.cambridgeincolour.com/color-management-printing.htm
One thing that helped me better understand Color Managed Workflows is that each Color Space (Color Profile) whether it is an editing color space or a device color space, uses different RGB color numbers in each one. Typically the larger gamut color spaces use smaller color numbers to represent the same visual color. So each color space/profile is its own color scale.
One of the key jobs of Color Management is to convert/translate those color numbers every time you move from one space to another space to preserve the same visual color best. It some respects, Color Management is analogous to a universal translator so each editing space/device space will have the correct numbers to reproduce the desired color best.
Given that description, here are the things that are needed to have good color management (i.e., Color Managed Workflow)
1) You need to use software that is color managed (i.e., uses the universal translator)
2) Each device needs to have an accurate color space representation. The universal translator needs to know the language it is translating. That means devices that are calibrated and profiled by you, or you are provided the color profile and use the color profile for that device
3) The universal translator needs ot know the color space (language) that the incoming image is set to. It won't know unless you embed/attach the color profile into the image. If you don't, the translator will be guessing on the color space for that image. The analogy is this. If someone tells you it is 25 degrees outside, you don't know how to dress for the weather unless you are also told which temperature scale is being used. If you don't know if it is Fahrenheit or Celsius, then you might dress the wrong way.
4) When a color profile is created for a device such as a monitor, it is created with a screen luminosity at some level. The color profile is actually only valid for that screen luminosity. To have the desired tone to match properly on a variety of devices. Before creating a profile, technically it is called calibration to put the device into a known condition (e.g, brightness, contrast, RGB settings, etc depending on all the options the monitor allows.).
So in simple terms, a universal translator needs to be used (Color Managed software), you need to know which language you are translating from (the color space of the incoming image from its embedded color space profile), and the language to which you are translating (the color space/profile of the target device)
Note that all the OS settings for Color Management is to make sure the universal translator is set up right. If the settings are wrong, the universal translator (color management) will be wrong.
Lightroom is color managed, and to the first order, so is Photoshop. (PS settings need to be correct under Edit > Color Settings).
Images need their color space to be embedded. I am pretty sure Lightroom does not give you a choice and embeds a profile. In Photoshop, there are options when you save images, whether you should attach the color space - you should attach/embed the color space.
Note, there is software that is not color managed. Some photo viewers are not, and some browsers are not color managed.
So, to the first order, I think that is it.
Less critical, there are second-order factors in color management that I will not give details.
Wider gamut color spaces have colors that cannot be represented in smaller color spaces; there are choices on how that should be handled. Those options are called rendering intents.
Some color spaces have different absolute black levels. There is a choice in management called "Black Point Compensation"
To get some sense of how the image will look in a different color space, that process is called "soft proofing," which both Lightroom and Photoshop support.
------------------------
So in your case, a lot of your actions are in line with a Color Managed Workflow. I hope the above higher-level description is more helpful rather than confusing.
|
