From: Yuri Khan <yuri.v.khan@gmail.com>
To: "Mattias Engdegård" <mattiase@acm.org>
Cc: Stefan Monnier <monnier@iro.umontreal.ca>,
Emacs developers <emacs-devel@gnu.org>
Subject: Re: master 68ae6fa: Improved light/dark colour predicate (bug#41544)
Date: Sat, 13 Jun 2020 01:36:30 +0700 [thread overview]
Message-ID: <CAP_d_8WiUsdUbGfCuRZ_QF0-hvBUSAmpVcPcQG77MDa5YpjzBg@mail.gmail.com> (raw)
In-Reply-To: <93F81C41-E774-4C02-9E9D-5B2CD1F66445@acm.org>
On Fri, 12 Jun 2020 at 22:50, Mattias Engdegård <mattiase@acm.org> wrote:
> Please load the attached code (any Emacs version), and run M-x contrast-compare with various cutoff values on your favourite system, to find what value is best for readability of the colour names (first column).
> Please reply (to emacs-devel or to me) the following pieces of information:
>
> * the cutoff value you found optimal
> * system information: window system, screen, anything you think is relevant
> * whether you use a light or dark background in your Emacs
Despite science calling for .18, I find that my subjective optimal
cutoff is somewhere between .25 and .31, even if I change the formulae
to more accurately model the piecewise gamma correction of sRGB:
- (r (expt (nth 0 rgb) 2.2))
+ (R (nth 0 rgb))
+ (r (if (<= R 0.03928)
+ (/ R 12.92)
+ (expt (/ (+ R 0.055) 1.055) 2.4)))
(same for g and b.)
I am on GTK+3/X11, Dell P2415Q (HiDPI IPS), RGB-subpixel slight-hinted
Cousine font at 10.5pt, on overall dark gray background (#414042).
next prev parent reply other threads:[~2020-06-12 18:36 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200610181238.9796.44750@vcs0.savannah.gnu.org>
[not found] ` <20200610181239.947C4204DF@vcs0.savannah.gnu.org>
2020-06-10 19:20 ` master 68ae6fa: Improved light/dark colour predicate (bug#41544) Stefan Monnier
2020-06-10 19:34 ` Mattias Engdegård
2020-06-10 20:01 ` Stefan Monnier
2020-06-11 5:15 ` Yuri Khan
2020-06-11 16:15 ` Mattias Engdegård
2020-06-11 19:22 ` Yuri Khan
2020-06-12 15:50 ` Mattias Engdegård
2020-06-12 16:22 ` tomas
2020-06-12 18:36 ` Yuri Khan [this message]
2020-06-13 10:55 ` Mattias Engdegård
2020-06-12 19:02 ` Drew Adams
2020-06-12 19:09 ` Stephen Leake
2020-06-18 19:28 ` Mattias Engdegård
2020-06-18 19:35 ` Drew Adams
2020-06-18 20:04 ` Mattias Engdegård
2020-06-18 20:32 ` Drew Adams
2020-06-21 7:51 ` Mattias Engdegård
2020-06-18 19:40 ` Basil L. Contovounesios
2020-06-18 19:58 ` Mattias Engdegård
2020-06-13 4:05 ` Richard Stallman
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