topic Re: Index Color / True Color / Color Books in AutoCAD Forum

Index Color / True Color / Color Books

Anonymous — Wed, 29 May 2019 17:22:16 GMT

When the standard color number is not your desired color and you have to customize it with specific hues, saturation and luminance, how is the best way to do this? I like the thinness of the red lines on my title block borders because it makes the text easier to read atop the border lines.

However, when doing dwg's to pdf's for customers, the red stands out unnecessarily on the black and white pdf, and so I am trying to get the darkest red (closest to black) as possible if someone could help me better learn the HSL and RGB color model settings to do this.

Thanks in advance.

Re: Index Color / True Color / Color Books

leeminardi — Wed, 29 May 2019 17:53:31 GMT

For True color you define 1 of 16777216 colors (2^24) by the amount of red, green, and blue. Each of these primary colors will have a value between 0 and 255.

255,0,0 defines the brightest pure red. To get a darker red decrease the amount of red. For example, 82,0,0 will be a dark red.

The equivalent in the HSL scale is 0,100,16 as you can see here:

If you were to add equal amount of green and blue the red color would become less saturated (less pure) and would look muddy. I think it best to use the RGB scale for your goal.