* bug#24273: 25.1.50; Unexpected return value from `color-name-to-rgb'
@ 2016-08-20 9:47 Simen Heggestøyl
2016-08-20 10:06 ` Julien Danjou
0 siblings, 1 reply; 9+ messages in thread
From: Simen Heggestøyl @ 2016-08-20 9:47 UTC (permalink / raw)
To: 24273; +Cc: julien
The docstring for `color-name-to-rgb' states the following:
"Normally the return value is a list of three floating-point numbers,
(RED GREEN BLUE), each between 0.0 and 1.0 inclusive."
When passing the hex value for white the return value is as expected:
(color-name-to-rgb "#ffffff")
⇒ (1.0 1.0 1.0)
But when passing the name of the same color, the return value becomes
different:
(color-name-to-rgb "white")
⇒ (1.00390625 1.00390625 1.00390625)
In GNU Emacs 25.1.50.134 (x86_64-pc-linux-gnu, GTK+ Version 3.20.7)
of 2016-08-20 built on x240
Repository revision: a4ba426d25bd6a5cbe11d81b82a789b8a2c948ed
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description: Debian GNU/Linux testing (stretch)
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
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FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11
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locale-coding-system: utf-8-unix
Major mode: Lisp Interaction
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tooltip-mode: t
global-eldoc-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
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font-lock-mode: t
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hashtable-print-readable backquote dbusbind inotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)
Memory information:
((conses 16 99389 6019)
(symbols 48 20750 0)
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(strings 32 18640 5788)
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^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#24273: 25.1.50; Unexpected return value from `color-name-to-rgb'
2016-08-20 9:47 bug#24273: 25.1.50; Unexpected return value from `color-name-to-rgb' Simen Heggestøyl
@ 2016-08-20 10:06 ` Julien Danjou
2016-08-20 10:11 ` Simen Heggestøyl
0 siblings, 1 reply; 9+ messages in thread
From: Julien Danjou @ 2016-08-20 10:06 UTC (permalink / raw)
To: Simen Heggestøyl; +Cc: 24273
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On Sat, Aug 20 2016, Simen Heggestøyl wrote:
> The docstring for `color-name-to-rgb' states the following:
>
> "Normally the return value is a list of three floating-point numbers,
> (RED GREEN BLUE), each between 0.0 and 1.0 inclusive."
>
> When passing the hex value for white the return value is as expected:
>
> (color-name-to-rgb "#ffffff")
> ⇒ (1.0 1.0 1.0)
>
> But when passing the name of the same color, the return value becomes
> different:
>
> (color-name-to-rgb "white")
> ⇒ (1.00390625 1.00390625 1.00390625)
What are the return values of:
(color-values "white")
and
(color-values "#ffffff")
?
--
Julien Danjou
/* Free Software hacker
https://julien.danjou.info */
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^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#24273: 25.1.50; Unexpected return value from `color-name-to-rgb'
2016-08-20 10:06 ` Julien Danjou
@ 2016-08-20 10:11 ` Simen Heggestøyl
2016-08-20 11:34 ` Eli Zaretskii
0 siblings, 1 reply; 9+ messages in thread
From: Simen Heggestøyl @ 2016-08-20 10:11 UTC (permalink / raw)
To: Julien Danjou; +Cc: 24273
On Sat, Aug 20, 2016 at 12:06 PM, Julien Danjou <julien@danjou.info>
wrote:
> What are the return values of:
> (color-values "white")
> and
> (color-values "#ffffff")
> ?
(color-values "white")
⇒ (65535 65535 65535)
(color-values "#ffffff")
⇒ (65280 65280 65280)
-- Simen
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#24273: 25.1.50; Unexpected return value from `color-name-to-rgb'
2016-08-20 10:11 ` Simen Heggestøyl
@ 2016-08-20 11:34 ` Eli Zaretskii
2016-08-20 12:07 ` Andreas Schwab
0 siblings, 1 reply; 9+ messages in thread
From: Eli Zaretskii @ 2016-08-20 11:34 UTC (permalink / raw)
To: Simen Heggestøyl; +Cc: julien, 24273
> Date: Sat, 20 Aug 2016 12:11:46 +0200
> From: Simen Heggestøyl <simenheg@gmail.com>
> Cc: 24273@debbugs.gnu.org
>
> On Sat, Aug 20, 2016 at 12:06 PM, Julien Danjou <julien@danjou.info>
> wrote:
> > What are the return values of:
> > (color-values "white")
> > and
> > (color-values "#ffffff")
> > ?
>
> (color-values "white")
> ⇒ (65535 65535 65535)
>
> (color-values "#ffffff")
> ⇒ (65280 65280 65280)
Which means "white" and "#ffffff" are not the same color.
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#24273: 25.1.50; Unexpected return value from `color-name-to-rgb'
2016-08-20 11:34 ` Eli Zaretskii
@ 2016-08-20 12:07 ` Andreas Schwab
2016-08-20 12:17 ` Eli Zaretskii
0 siblings, 1 reply; 9+ messages in thread
From: Andreas Schwab @ 2016-08-20 12:07 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: julien, Simen Heggestøyl, 24273
On Aug 20 2016, Eli Zaretskii <eliz@gnu.org> wrote:
>> Date: Sat, 20 Aug 2016 12:11:46 +0200
>> From: Simen Heggestøyl <simenheg@gmail.com>
>> Cc: 24273@debbugs.gnu.org
>>
>> On Sat, Aug 20, 2016 at 12:06 PM, Julien Danjou <julien@danjou.info>
>> wrote:
>> > What are the return values of:
>> > (color-values "white")
>> > and
>> > (color-values "#ffffff")
>> > ?
>>
>> (color-values "white")
>> ⇒ (65535 65535 65535)
>>
>> (color-values "#ffffff")
>> ⇒ (65280 65280 65280)
>
> Which means "white" and "#ffffff" are not the same color.
Actually they are, because #ffffff and #ffffffffffff are the same color
on a display with 8 bits per color.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#24273: 25.1.50; Unexpected return value from `color-name-to-rgb'
2016-08-20 12:07 ` Andreas Schwab
@ 2016-08-20 12:17 ` Eli Zaretskii
2016-08-20 12:32 ` Julien Danjou
2016-08-20 14:23 ` Andreas Schwab
0 siblings, 2 replies; 9+ messages in thread
From: Eli Zaretskii @ 2016-08-20 12:17 UTC (permalink / raw)
To: Andreas Schwab; +Cc: julien, simenheg, 24273
> From: Andreas Schwab <schwab@linux-m68k.org>
> Cc: Simen Heggestøyl <simenheg@gmail.com>,
> julien@danjou.info, 24273@debbugs.gnu.org
> Date: Sat, 20 Aug 2016 14:07:08 +0200
>
> On Aug 20 2016, Eli Zaretskii <eliz@gnu.org> wrote:
>
> >> Date: Sat, 20 Aug 2016 12:11:46 +0200
> >> From: Simen Heggestøyl <simenheg@gmail.com>
> >> Cc: 24273@debbugs.gnu.org
> >>
> >> On Sat, Aug 20, 2016 at 12:06 PM, Julien Danjou <julien@danjou.info>
> >> wrote:
> >> > What are the return values of:
> >> > (color-values "white")
> >> > and
> >> > (color-values "#ffffff")
> >> > ?
> >>
> >> (color-values "white")
> >> ⇒ (65535 65535 65535)
> >>
> >> (color-values "#ffffff")
> >> ⇒ (65280 65280 65280)
> >
> > Which means "white" and "#ffffff" are not the same color.
>
> Actually they are, because #ffffff and #ffffffffffff are the same color
> on a display with 8 bits per color.
I don't think I follow you. What does 8 bits per color have to do
with this, and how do you know the OP has 8 bits per color on his
display?
FWIW, on my display, I get (65535 65535 65535) for both expressions.
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#24273: 25.1.50; Unexpected return value from `color-name-to-rgb'
2016-08-20 12:17 ` Eli Zaretskii
@ 2016-08-20 12:32 ` Julien Danjou
2016-08-22 6:12 ` Simen Heggestøyl
2016-08-20 14:23 ` Andreas Schwab
1 sibling, 1 reply; 9+ messages in thread
From: Julien Danjou @ 2016-08-20 12:32 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: Andreas Schwab, simenheg, 24273
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On Sat, Aug 20 2016, Eli Zaretskii wrote:
> I don't think I follow you. What does 8 bits per color have to do
> with this, and how do you know the OP has 8 bits per color on his
> display?
>
> FWIW, on my display, I get (65535 65535 65535) for both expressions.
I get (65280 65280 65280) for both on my display.
The problem is that `color-name-to-rgb' expect to find the brightest
point by calling (color-values "#ffffff") whereas it seems in this case
it's less bright than "white". Is that something possible?
What kind of system are you running Simen?
--
Julien Danjou
;; Free Software hacker
;; https://julien.danjou.info
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^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#24273: 25.1.50; Unexpected return value from `color-name-to-rgb'
2016-08-20 12:32 ` Julien Danjou
@ 2016-08-22 6:12 ` Simen Heggestøyl
0 siblings, 0 replies; 9+ messages in thread
From: Simen Heggestøyl @ 2016-08-22 6:12 UTC (permalink / raw)
To: Julien Danjou; +Cc: Andreas Schwab, 24273
On Sat, Aug 20, 2016 at 2:32 PM, Julien Danjou <julien@danjou.info>
wrote:
> I get (65280 65280 65280) for both on my display.
>
> The problem is that `color-name-to-rgb' expect to find the brightest
> point by calling (color-values "#ffffff") whereas it seems in this
> case
> it's less bright than "white". Is that something possible?
>
> What kind of system are you running Simen?
I'm running Debian (testing).
-- Simen
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#24273: 25.1.50; Unexpected return value from `color-name-to-rgb'
2016-08-20 12:17 ` Eli Zaretskii
2016-08-20 12:32 ` Julien Danjou
@ 2016-08-20 14:23 ` Andreas Schwab
1 sibling, 0 replies; 9+ messages in thread
From: Andreas Schwab @ 2016-08-20 14:23 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: julien, simenheg, 24273
On Aug 20 2016, Eli Zaretskii <eliz@gnu.org> wrote:
> I don't think I follow you. What does 8 bits per color have to do
> with this,
Only the upper 8 bits are significant.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
^ permalink raw reply [flat|nested] 9+ messages in thread
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Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-08-20 9:47 bug#24273: 25.1.50; Unexpected return value from `color-name-to-rgb' Simen Heggestøyl
2016-08-20 10:06 ` Julien Danjou
2016-08-20 10:11 ` Simen Heggestøyl
2016-08-20 11:34 ` Eli Zaretskii
2016-08-20 12:07 ` Andreas Schwab
2016-08-20 12:17 ` Eli Zaretskii
2016-08-20 12:32 ` Julien Danjou
2016-08-22 6:12 ` Simen Heggestøyl
2016-08-20 14:23 ` Andreas Schwab
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