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* bug#27086: perhaps always use a white background when viewing transparent PNGs etc.
@ 2017-05-26 13:37 積丹尼 Dan Jacobson
  2017-06-03  3:25 ` npostavs
                   ` (6 more replies)
  0 siblings, 7 replies; 12+ messages in thread
From: 積丹尼 Dan Jacobson @ 2017-05-26 13:37 UTC (permalink / raw)
  To: 27086

With this color,
(add-to-list 'default-frame-alist '(background-color . "DarkSlateGray"))
looking at
http://jidanni.org/location/directions/qingfujie_slope.png
is tough for the words outside the graph.
So perhaps always use a white background when viewing transparent PNGs, etc.





^ permalink raw reply	[flat|nested] 12+ messages in thread

* bug#27086: perhaps always use a white background when viewing transparent PNGs etc.
  2017-05-26 13:37 bug#27086: perhaps always use a white background when viewing transparent PNGs etc 積丹尼 Dan Jacobson
@ 2017-06-03  3:25 ` npostavs
  2017-06-06 19:40 ` 積丹尼 Dan Jacobson
                   ` (5 subsequent siblings)
  6 siblings, 0 replies; 12+ messages in thread
From: npostavs @ 2017-06-03  3:25 UTC (permalink / raw)
  To: 積丹尼 Dan Jacobson; +Cc: 27086

[-- Attachment #1: Type: text/plain, Size: 368 bytes --]

積丹尼 Dan Jacobson <jidanni@jidanni.org> writes:

> With this color,
> (add-to-list 'default-frame-alist '(background-color . "DarkSlateGray"))
> looking at
> http://jidanni.org/location/directions/qingfujie_slope.png
> is tough for the words outside the graph.

I don't see any problem.  It looks like that png has a non-transparent
white background?


[-- Attachment #2: screenshot with default background colour --]
[-- Type: image/png, Size: 35769 bytes --]

[-- Attachment #3: screenshot with gray background colour --]
[-- Type: image/png, Size: 35703 bytes --]

[-- Attachment #4: Type: text/plain, Size: 240 bytes --]


> So perhaps always use a white background when viewing transparent PNGs, etc.

Seems to me if a PNG needs a certain background colour to be readable,
then it shouldn't be transparent.  What if you had a transparent PNG
with white words?


^ permalink raw reply	[flat|nested] 12+ messages in thread

* bug#27086: perhaps always use a white background when viewing transparent PNGs etc.
  2017-05-26 13:37 bug#27086: perhaps always use a white background when viewing transparent PNGs etc 積丹尼 Dan Jacobson
  2017-06-03  3:25 ` npostavs
@ 2017-06-06 19:40 ` 積丹尼 Dan Jacobson
  2019-09-29  2:27 ` Stefan Kangas
                   ` (4 subsequent siblings)
  6 siblings, 0 replies; 12+ messages in thread
From: 積丹尼 Dan Jacobson @ 2017-06-06 19:40 UTC (permalink / raw)
  To: npostavs; +Cc: 27086

[-- Attachment #1: Type: text/plain, Size: 207 bytes --]

Here's what I see when I save
http://jidanni.org/location/directions/qingfujie_slope.png
to disk and use C-x C-f on it with my
(add-to-list 'default-frame-alist '(background-color . "DarkSlateGray"))
color.

[-- Attachment #2: d.jpg --]
[-- Type: image/jpeg, Size: 25788 bytes --]

^ permalink raw reply	[flat|nested] 12+ messages in thread

* bug#27086: perhaps always use a white background when viewing transparent PNGs etc.
  2017-05-26 13:37 bug#27086: perhaps always use a white background when viewing transparent PNGs etc 積丹尼 Dan Jacobson
  2017-06-03  3:25 ` npostavs
  2017-06-06 19:40 ` 積丹尼 Dan Jacobson
@ 2019-09-29  2:27 ` Stefan Kangas
  2019-09-29  4:23 ` 積丹尼 Dan Jacobson
                   ` (3 subsequent siblings)
  6 siblings, 0 replies; 12+ messages in thread
From: Stefan Kangas @ 2019-09-29  2:27 UTC (permalink / raw)
  To: 積丹尼 Dan Jacobson; +Cc: 27086, Noam Postavsky

積丹尼 Dan Jacobson <jidanni@jidanni.org> writes:

> Here's what I see when I save
> http://jidanni.org/location/directions/qingfujie_slope.png
> to disk and use C-x C-f on it with my
> (add-to-list 'default-frame-alist '(background-color . "DarkSlateGray"))
> color.

I can't reproduce this on current master using:

0. emacs -Q
1. Evaluate:
(add-to-list 'default-frame-alist '(background-color . "DarkSlateGray"))
2. C-x 5 2
3. C-x C-f qingfujie_slope.png RET

Result is a gray background, but the image displays just fine.

Are you still seeing this?

Best regards,
Stefan Kangas





^ permalink raw reply	[flat|nested] 12+ messages in thread

* bug#27086: perhaps always use a white background when viewing transparent PNGs etc.
  2017-05-26 13:37 bug#27086: perhaps always use a white background when viewing transparent PNGs etc 積丹尼 Dan Jacobson
                   ` (2 preceding siblings ...)
  2019-09-29  2:27 ` Stefan Kangas
@ 2019-09-29  4:23 ` 積丹尼 Dan Jacobson
  2019-09-29  4:29   ` Stefan Kangas
  2019-09-29  4:59 ` 積丹尼 Dan Jacobson
                   ` (2 subsequent siblings)
  6 siblings, 1 reply; 12+ messages in thread
From: 積丹尼 Dan Jacobson @ 2019-09-29  4:23 UTC (permalink / raw)
  To: Stefan Kangas; +Cc: 27086, Noam Postavsky

>>>>> "SK" == Stefan Kangas <stefan@marxist.se> writes:

SK> Result is a gray background, but the image displays just fine.

Well I got rid of all the transparency on my website. So you will need a
different transparent test file.





^ permalink raw reply	[flat|nested] 12+ messages in thread

* bug#27086: perhaps always use a white background when viewing transparent PNGs etc.
  2019-09-29  4:23 ` 積丹尼 Dan Jacobson
@ 2019-09-29  4:29   ` Stefan Kangas
  0 siblings, 0 replies; 12+ messages in thread
From: Stefan Kangas @ 2019-09-29  4:29 UTC (permalink / raw)
  To: 積丹尼 Dan Jacobson; +Cc: 27086, Noam Postavsky

Dan Jacobson <jidanni@jidanni.org> writes:

> SK> Result is a gray background, but the image displays just fine.
>
> Well I got rid of all the transparency on my website. So you will need a
> different transparent test file.

Could you please provide an image where you can reproduce this issue?

Best regards,
Stefan Kangas





^ permalink raw reply	[flat|nested] 12+ messages in thread

* bug#27086: perhaps always use a white background when viewing transparent PNGs etc.
  2017-05-26 13:37 bug#27086: perhaps always use a white background when viewing transparent PNGs etc 積丹尼 Dan Jacobson
                   ` (3 preceding siblings ...)
  2019-09-29  4:23 ` 積丹尼 Dan Jacobson
@ 2019-09-29  4:59 ` 積丹尼 Dan Jacobson
  2019-09-29 10:27   ` Lars Ingebrigtsen
  2019-09-29 15:33 ` 積丹尼 Dan Jacobson
  2019-09-29 16:08 ` 積丹尼 Dan Jacobson
  6 siblings, 1 reply; 12+ messages in thread
From: 積丹尼 Dan Jacobson @ 2019-09-29  4:59 UTC (permalink / raw)
  To: Stefan Kangas; +Cc: 27086, Noam Postavsky

[-- Attachment #1: Type: text/plain, Size: 95 bytes --]

OK. Let's start fresh.
Something I'm doing in https://www.jidanni.org/comp/configuration
makes

[-- Attachment #2: N.png --]
[-- Type: image/png, Size: 16627 bytes --]

[-- Attachment #3: Type: text/plain, Size: 12 bytes --]

render like

[-- Attachment #4: Yuck.jpg --]
[-- Type: image/jpeg, Size: 25961 bytes --]

[-- Attachment #5: Type: text/plain, Size: 178 bytes --]

just as ugly as it does in chromium.

But it looks great in firefox, and emacs -Q.
So there is something in my above configuration causing it to look ugly.

emacs-version "26.3"

^ permalink raw reply	[flat|nested] 12+ messages in thread

* bug#27086: perhaps always use a white background when viewing transparent PNGs etc.
  2019-09-29  4:59 ` 積丹尼 Dan Jacobson
@ 2019-09-29 10:27   ` Lars Ingebrigtsen
  0 siblings, 0 replies; 12+ messages in thread
From: Lars Ingebrigtsen @ 2019-09-29 10:27 UTC (permalink / raw)
  To: 積丹尼 Dan Jacobson
  Cc: 27086, Stefan Kangas, Noam Postavsky

積丹尼 Dan Jacobson <jidanni@jidanni.org> writes:

> OK. Let's start fresh.
> Something I'm doing in https://www.jidanni.org/comp/configuration
> makes

I'm guessing it's an image rendered towards white, but with a
transparent background?  And you have a black background in your Emacs?

Then there's nothing we can do here -- the PNG itself is badly made
(instead of using alpha channels it's just marking pixels as either
fully transparent or fully opaque).

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no





^ permalink raw reply	[flat|nested] 12+ messages in thread

* bug#27086: perhaps always use a white background when viewing transparent PNGs etc.
  2017-05-26 13:37 bug#27086: perhaps always use a white background when viewing transparent PNGs etc 積丹尼 Dan Jacobson
                   ` (4 preceding siblings ...)
  2019-09-29  4:59 ` 積丹尼 Dan Jacobson
@ 2019-09-29 15:33 ` 積丹尼 Dan Jacobson
  2019-09-29 16:00   ` Lars Ingebrigtsen
  2019-09-29 16:08 ` 積丹尼 Dan Jacobson
  6 siblings, 1 reply; 12+ messages in thread
From: 積丹尼 Dan Jacobson @ 2019-09-29 15:33 UTC (permalink / raw)
  To: Stefan Kangas; +Cc: 27086, Noam Postavsky

>>>>> "LI" == Lars Ingebrigtsen <larsi@gnus.org> writes:
LI> you have a black background in your Emacs?

Yes.

LI> Then there's nothing we can do here -- the PNG itself is badly made
LI> (instead of using alpha channels it's just marking pixels as either
LI> fully transparent or fully opaque).

Well looks great in Firefox.
Firefox always does the right thing.





^ permalink raw reply	[flat|nested] 12+ messages in thread

* bug#27086: perhaps always use a white background when viewing transparent PNGs etc.
  2019-09-29 15:33 ` 積丹尼 Dan Jacobson
@ 2019-09-29 16:00   ` Lars Ingebrigtsen
  0 siblings, 0 replies; 12+ messages in thread
From: Lars Ingebrigtsen @ 2019-09-29 16:00 UTC (permalink / raw)
  To: 積丹尼 Dan Jacobson
  Cc: 27086, Stefan Kangas, Noam Postavsky

積丹尼 Dan Jacobson <jidanni@jidanni.org> writes:

> LI> Then there's nothing we can do here -- the PNG itself is badly made
> LI> (instead of using alpha channels it's just marking pixels as either
> LI> fully transparent or fully opaque).
>
> Well looks great in Firefox.
> Firefox always does the right thing.

Sounds like Firefox defaults to white backgrounds on these images, but
if the PNG had been constructed the other way (towards black), then that
would have looked equally bad.

So it doesn't seem like there's anything we can do here.

Did you forward the original PNG file to the bug tracker?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no





^ permalink raw reply	[flat|nested] 12+ messages in thread

* bug#27086: perhaps always use a white background when viewing transparent PNGs etc.
  2017-05-26 13:37 bug#27086: perhaps always use a white background when viewing transparent PNGs etc 積丹尼 Dan Jacobson
                   ` (5 preceding siblings ...)
  2019-09-29 15:33 ` 積丹尼 Dan Jacobson
@ 2019-09-29 16:08 ` 積丹尼 Dan Jacobson
  2019-09-29 16:11   ` Lars Ingebrigtsen
  6 siblings, 1 reply; 12+ messages in thread
From: 積丹尼 Dan Jacobson @ 2019-09-29 16:08 UTC (permalink / raw)
  To: Lars Ingebrigtsen; +Cc: 27086, Stefan Kangas, Noam Postavsky

Well then you are supposed to use a checkerboard pattern I suppose.
https://bugs.chromium.org/p/chromium/issues/detail?id=991197
Not just leave things up to chance so they look good for Mr. X, but not
when sent to Mr. X's boss or later during a conference.

(LI> Did you forward the original PNG file to the bug tracker?
Just use the latest attachment I added.)





^ permalink raw reply	[flat|nested] 12+ messages in thread

* bug#27086: perhaps always use a white background when viewing transparent PNGs etc.
  2019-09-29 16:08 ` 積丹尼 Dan Jacobson
@ 2019-09-29 16:11   ` Lars Ingebrigtsen
  0 siblings, 0 replies; 12+ messages in thread
From: Lars Ingebrigtsen @ 2019-09-29 16:11 UTC (permalink / raw)
  To: 積丹尼 Dan Jacobson
  Cc: 27086, Stefan Kangas, Noam Postavsky

積丹尼 Dan Jacobson <jidanni@jidanni.org> writes:

> Well then you are supposed to use a checkerboard pattern I suppose.
> https://bugs.chromium.org/p/chromium/issues/detail?id=991197
> Not just leave things up to chance so they look good for Mr. X, but not
> when sent to Mr. X's boss or later during a conference.

Heh, I don't think so.  Most transparent images look nice.

> (LI> Did you forward the original PNG file to the bug tracker?
> Just use the latest attachment I added.)

Oh, I thought that PNG was to demonstrate how it looked in Emacs.  If
you want to look what it looks like with a checkerboard, open it in
gimp.

(Spoilers: It looks horrible.)

So there's no bug on Emacs' side -- the image is just badly made.
Closing.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no





^ permalink raw reply	[flat|nested] 12+ messages in thread

end of thread, other threads:[~2019-09-29 16:11 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2017-05-26 13:37 bug#27086: perhaps always use a white background when viewing transparent PNGs etc 積丹尼 Dan Jacobson
2017-06-03  3:25 ` npostavs
2017-06-06 19:40 ` 積丹尼 Dan Jacobson
2019-09-29  2:27 ` Stefan Kangas
2019-09-29  4:23 ` 積丹尼 Dan Jacobson
2019-09-29  4:29   ` Stefan Kangas
2019-09-29  4:59 ` 積丹尼 Dan Jacobson
2019-09-29 10:27   ` Lars Ingebrigtsen
2019-09-29 15:33 ` 積丹尼 Dan Jacobson
2019-09-29 16:00   ` Lars Ingebrigtsen
2019-09-29 16:08 ` 積丹尼 Dan Jacobson
2019-09-29 16:11   ` Lars Ingebrigtsen

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