topic Betreff: Different result when converting from Color Index (ACI) to RGB on RTX and Quadro graphic card in AutoCAD Forum

Different result when converting from Color Index (ACI) to RGB on RTX and Quadro graphic card

m.nguyenLFD44 — Fri, 12 Nov 2021 09:54:05 GMT

I have 1 DWG file whereas need to change layer color from AutoCAD Color Index to RGB.

Spot check on some colors on large palette and second palette, ACI 60, 181 -->the result is the same on both RTX and Quadro graphic card.

But, there's issue with third palette from color 250 to 254.

Index RTX RGB Quadro RGB

250 0, 0, 0 51, 51, 51

251 101, 101, 101 91, 91, 91

252 102, 102, 102 132, 132, 132

253 153, 153, 153 173, 173, 173

254 204, 204, 204 214, 214, 214

Does anybody know the reason? and is there any color has the same issue as listed?

Thank you all.

cadffm — Fri, 12 Nov 2021 10:07:43 GMT

Your Title looks great and interesting, but i guess you are on the wrong track!

I guess you "tested" this with different background colors, or not?

>>Does anybody know the reason?

In Color dialog and also the color of your objects on monitor,

the rgb color/value is depending of the background-color.

For example: 33,40,48 vs color black OPTIONS, Display [color]

>>and is there any color has the same issue as listed?"

depend on your backgroundcolor

Q:If you need to change ALL colors, use a program which can do that!

You will find some "ACI2RGB" tools and the result should be good enough.

(I can talk about some more thoughts, but i am out at this point, HTH)

m.nguyenLFD44 — Fri, 12 Nov 2021 10:18:02 GMT

Oh, dear
I tested on different computer and dismissed the background color.
You gave me a perfect answer. Thank you very much.