How do I create a color?

Forum|Forum|8 years ago
February 28, 2018
9 replies
1060 views

I want to create a color that has the following properties:

red: 1

green: .478431

blue: 1

alpha: 1

How do I do that in the Photoshop CC 2018?

create color

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Correct answer Test Screen Name

This all seems unnecessarily complicated. The common way we see RGB colour values from 0 to 255 is wrong by every colour science. Colour values are actually in the range 0 to about 1. It so happens that in an 8 bit image that pixel values are in the range 0 to 255 And it’s become a common but wrong way to talk about colour values.

It’s rather bizarre that in the same breath we talk about CMYK values as being in the range 0 to 100, since they are also actually in the range 0.0 to 1.0, and stored in an 8 not image as 0 to 255.

Anyway if you have correct colour values in the range 0 to 1, but have to use a colour picker in the range 0 to 255, just multiply your colour values by 255.0. Job done, no need to convert to 32 bit, imagine they must be XYZ (no!) or do anything else.

T

Test Screen Name

Legend

Alpha in photoshop isn’t a colour property. It’s (always) an amount of transparency but in Photoshop you do this with transparency effects. The good news is that alpha = 1.0 means fully opaque, just normal. So you ignore it.

T

teachbit

Participating Frequently

as Semaphoric said: "The Alpha value could be the opacity of a layer, or a layer mask, or a saved selection, or any number of things."

Vishu_Aggarwal

Participating Frequently

The float colors values (.478431) are achievable only in 32bit color Bit depth, you need to change the current document to use 32bit colour channel, you can do so by going to Menu > Image > Mode > 32 bit channel than open color picker to enter the RGB values, and alpha is extra channel added in a RGB color document, if you working with transparency(I.E. Masking ).

Screenshots for reference -

Vishu AggarwalAdobe Certified Instructor, Professional and Expert

T

Test Screen NameCorrect answer

Legend

This all seems unnecessarily complicated. The common way we see RGB colour values from 0 to 255 is wrong by every colour science. Colour values are actually in the range 0 to about 1. It so happens that in an 8 bit image that pixel values are in the range 0 to 255 And it’s become a common but wrong way to talk about colour values.

It’s rather bizarre that in the same breath we talk about CMYK values as being in the range 0 to 100, since they are also actually in the range 0.0 to 1.0, and stored in an 8 not image as 0 to 255.

Anyway if you have correct colour values in the range 0 to 1, but have to use a colour picker in the range 0 to 255, just multiply your colour values by 255.0. Job done, no need to convert to 32 bit, imagine they must be XYZ (no!) or do anything else.