Hi Lars Thanks for that reply. <snip> First make sure the Gray working space, the RGB working space and the image profile have the same gamma, such as gamma 2.2. This is because when the readout mode is not same as the image mode, the info panel uses the working space profile(s) to convert from image to the readout mode. Using the same gamma on all profiles assures that gray values convert to same RGB values. Thanks Lars. Thats a very clever solution. But I have to say that outside of a few photoshop users on this colorsync list, it's not a solution many photoshop users would think of to answer the question "what's the (0-255) value of the gray file I'm working on?". And even right now, with what I know, I am still wondering what RGB space has a gamma of Dot Gain 20%? For when I am tweaking the layered Dot Gain 20% Gray Space files I'm given. So I am wondering if you could advocate for Adobe to make the task of inspecting the 0-255 RGB values of grayscale images easier for us that are less technically inclined. Much Thanks Perer Miles ________________________________ From: Lars Borg via colorsync-users <colorsync-users@lists.apple.com> Sent: Monday, 14 February 2022 12:30 pm To: andrew@digitaldog.net <andrew@digitaldog.net>; colorsync-users@lists.apple.com <colorsync-users@lists.apple.com> Subject: Re: Gray Gamma 2.2 space and Photoshop2022 (23.1.1) What???? The options are there in PS info panel, as long as you can multiply by 100. First make sure the Gray working space, the RGB working space and the image profile have the same gamma, such as gamma 2.2. This is because when the readout mode is not same as the image mode, the info panel uses the working space profile(s) to convert from image to the readout mode. Using the same gamma on all profiles assures that gray values convert to same RGB values. In the info panel: - For 0-255 readout of gray and RGB images, set the readout option to 8bit RGB. Gray 21 now read as 21,21,21. (The 8bit K readout is different, as 100% == black.) - For percentage readout of gray and RGB images, set the readout option to 32-bit. Multiply by 100% as 1.0 == 100%. This works for both K and RGB readouts. Lars, Adobe -----Original Message----- From: Andrew Rodney via colorsync-users <colorsync-users@lists.apple.com> Reply-To: "andrew@digitaldog.net" <andrew@digitaldog.net> Date: Sunday, February 13, 2022 at 12:49 PM To: "colorsync-users@lists.apple.com" <colorsync-users@lists.apple.com> Subject: Re: Gray Gamma 2.2 space and Photoshop2022 (23.1.1) On Feb 13, 2022, at 3:35 PM, Peter Miles via colorsync-users <colorsync-users@lists.apple.com> wrote:
QUESTION. I always think of the “actual values” of greyscale files as being values from 0 to 255. Not a percentage, as the Photoshops eyedropper “actual values” report. That’s my photography background.
In some situations, I want to know the actual 0-255 device values I'm sending in a grayscale file. Not just the device values 'reinterpreted' as a percentage. So how do you get photoshop to display the actual grayscale 0-255 values encoded in a grayscale file I have open. I can only use the RGB eyedropper display setting if I know in advance that my RGB “working colour space” uses the same gray-axis encoding as the grayscale file I have open? Or is there another way?
In Photoshop, you can view the RGB triplets as 0-255 scale (or high bit) and in Lightroom Classic it is 0-100 percent. I wish Adobe would provide both options in both products so we could always bounce back and forth, the don't. Gray again is yet another scale using 0-100%. And no, there is no 0-255 option/conversion. Maybe someone far more mathematically skilled (I'm not) can provide a simple calculation for each. My 'solution' is sticking with Lab which is an option in ACR/LR/PS. But again, I sure wish Adobe would simply allow us to toggle from each scale. Andrew Rodney https://apc01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.digitaldog.net%2F&data=04%7C01%7Cp.miles%40massey.ac.nz%7C3bb328a5bc814cecc2a508d9ef48d543%7C388728e1bbd0437898dcf8682e644300%7C1%7C0%7C637803918384751525%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=NMP68woGVEVY5T6DaLcRkJyxmKyYI%2FZZFHL0UUm88Ek%3D&reserved=0 _______________________________________________ Do not post admin requests to the list. They will be ignored. colorsync-users mailing list (colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.apple.com%2Fmailman%2Foptions%2Fcolorsync-users%2Fborg%2540adobe.com&data=04%7C01%7Cp.miles%40massey.ac.nz%7C3bb328a5bc814cecc2a508d9ef48d543%7C388728e1bbd0437898dcf8682e644300%7C1%7C0%7C637803918384751525%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=VQDzjNoUuTw26srSARLALJFxU38N9q325k6C%2BVcJxFA%3D&reserved=0 This email sent to borg@adobe.com