Colors in diagrams of spectra are different from reality

[DieterLa]

There are minor deviations from the real color impression in the colors used in the diagrams.
The attached pdf shows some examples.
The spectral range appearing yellow is quite narrow. Just from 570-600 nm.
600-620 appears orange. And 630 is already kind of red.
At 780 nm the human sensitivity is so little, that the color appears quite dull. Therefore 780 should be darker.
The green extends from 510-570, wider than shown on your graph.
Some years ago I spend some time to create a color-diagram which fits quite close to the real impression.
It is attached.
Of course in reality the color impression is also depending on the intensity. This has to be neglected on the image for the spectrum.
The colors are shown at an average intensity.

colors.pdf

[JZauner]

I will challenge myself to write a script extracting 401 hexcolors across the image you provided ;). Those I can use for the overlay.

[DieterLa]

Unfortunately I created this color-bar with Photoshop. I defined certain fixed colors at defined percentages, so the 401 nm are only defined at some fixed points and in between, there are smooth transitions made by Photoshop. Therefore I can’t provide you a table with the correlations of 401 nm to 401 colors. From: Johannes Zauner ***@***.***> Sent: Freitag, 15. September 2023 10:29 To: LiTGde/Spectran ***@***.***> Cc: Lang, Dieter ***@***.***>; Author ***@***.***> Subject: Re: [LiTGde/Spectran] Colors in diagrams of spectra are different from reality (Issue #14) I will challenge myself to write a script extracting 401 hexcolors across the image you provided ;). Those I can use for the overlay. — Reply to this email directly, view it on GitHub<#14 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/BCG2MURE22GPWV7RU7EI7G3X2QGWHANCNFSM6AAAAAA4EEVRPQ>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[JZauner]

I added two color palettes based on your pdf. One that is an exact replica of your image (I actually wrote a script) and one where the image was slightly brightened beforehand, just to make the graph not as dark. What do you think?