Why does bricscad have different color tones?

Kentral

In autocad color 253 is in RGB (203,203,203) and HSL (0,0,80)

But in Bricscad it is RGB (173,173,173) and HSL (0,0,67)

Can I customize the color range?

Virgil

Hello.

From my testing, in Autocad, the color index 253 is RGB(153,153,153) or HSL(0,0,60).

In Bricscad, there is a slight difference: index 253 is RGB(173,173,173) or HSL(0,0,67).

I found some older ACI reference where index 253 was RGB(130,130,130).

With both programs, RGB(153,153,153) is equivalent to HSL(0,0,60).
So, if color precision is required, the RGB color representation would be a solution for this case.

Wiebe van der Worp

Hello, I was under the impression that colour definitions were fairly consistent but so it turns out they are not. Just curious, why would you want to customize it?

I once wrote something about that, the aim was to determine a selection of index colours that were easily visible on both black and white backgrounds. If the index colours are converted to HSL, you can make a nice selection based on L like that. For those interested, here is the link.

Its_Alive

They are both the same in the API

import traceback
from pyrx_imp import Rx, Ge, Gi, Db, Ap, Ed, Gs, Ax, Pl


@Ap.Command("doit")
def doit():
    try:
        clr = Db.EntityColor()
        clr.setColorIndex(253)
        clr = clr.makeTrueColor()
        print(clr.red(), clr.green(), clr.blue())
    except Exception as err:
        print(traceback.format_exc())

# ACAD 173 173 173

# BCAD 173 173 173

Wiebe van der Worp

Lisp API same result, pasting this on the command-line:

(vle-aci2rgb 253)

evaluates to:

(173 173 173)

Perhaps OP is misled by colour profiling? A screen-dump here results also in the same result.