RSS/Atom feed Twitter
Site is read-only, email is disabled

Proposed usabillity enhancement for PNG handling

This discussion is connected to the gimp-user-list.gnome.org mailing list which is provided by the GIMP developers and not related to gimpusers.com.

This is a read-only list on gimpusers.com so this discussion thread is read-only, too.

7 of 8 messages available
Toggle history

Please log in to manage your subscriptions.

1224007205.7460.1.camel@bender 07 Oct 20:19
  Proposed usabillity enhancement for PNG handling Alchemie foto\\grafiche 14 Oct 23:41
   Proposed usabillity enhancement for PNG handling Sven Neumann 15 Oct 23:24
    Proposed usabillity enhancement for PNG handling Tobias Jakobs 16 Oct 09:00
     Proposed usabillity enhancement for PNG handling Sven Neumann 16 Oct 09:21
      Proposed usabillity enhancement for PNG handling Tobias Jakobs 16 Oct 10:33
       Proposed usabillity enhancement for PNG handling Tobias Jakobs 16 Oct 21:19
       Proposed usabillity enhancement for PNG handling Sven Neumann 17 Oct 09:04
Alchemie foto\\grafiche
2008-10-14 23:41:04 UTC (over 16 years ago)

Proposed usabillity enhancement for PNG handling

Sven Neumann wrote

That's not true. The current background color is used. So if you want
the background to be white, then you should set your background color to
white.

No. maybe "should" but does not for me

My background color is as default white and i seldom change that but all my png if converted to jpg get a black background

and anyway if was that the reason the color will be not always black ,since there are millions of other possible BG colors

But result never change : png transparency become in jpg is always black , never yellow green or red,and more relevant never white

this at least on my gimp 2.6.1 with windows xp

--- Mar 14/10/08, Sven Neumann ha scritto:

Da: Sven Neumann
Oggetto: Re: [Gimp-developer] Proposed usabillity enhancement for PNG handling A: fotocomics@yahoo.it
Cc: gimp-developer@lists.XCF.Berkeley.EDU Data: Martedì 14 ottobre 2008, 20:00 Hi,

On Tue, 2008-10-14 at 15:24 +0000, Alchemie foto\grafiche wrote:

When a PNG created with gimp is converted in JPG or

any other format

that do not support trnsparency transparent area

become black, while

they should be white

that happens if the conversion is done with gimp OR

any other SW .

That's not true. The current background color is used. So if you want
the background to be white, then you should set your background color to
white.

Sven

My background color is as default white and i seldom change that but all my png if converted get a black background

Scopri il blog di Yahoo! Mail: Trucchi, novità e scrivi la tua opinione. http://www.ymailblogit.com/blog

Sven Neumann
2008-10-15 23:24:50 UTC (over 16 years ago)

Proposed usabillity enhancement for PNG handling

Hi,

On Tue, 2008-10-14 at 21:41 +0000, Alchemie foto\grafiche wrote:

Sven Neumann wrote

That's not true. The current background color is used. So if you want
the background to be white, then you should set your background color to
white.

No. maybe "should" but does not for me

My background color is as default white and i seldom change that but all my png if converted to jpg get a black background

Could you perhaps explain to us how exactly you convert a PNG to a JPEG?

Sven

Tobias Jakobs
2008-10-16 09:00:30 UTC (over 16 years ago)

Proposed usabillity enhancement for PNG handling

On Wed, Oct 15, 2008 at 11:24 PM, Sven Neumann wrote:

My background color is as default white and i seldom change that but all my png if converted to jpg get a black background

Could you perhaps explain to us how exactly you convert a PNG to a JPEG?

I was able to reproduce the problem here, too. (Windows XP, Gimp 2.6.1) I created a new image with a transparent background painted some red strokes on it an saved it as PNG. Then I closed and reopened the image and saved it via File->Save As... (I just replaced the png with jpeg). Before that I set the background colour to green and the foreground colour to blue. The result was an image with an black background.

Regards,
Tobias

Sven Neumann
2008-10-16 09:21:08 UTC (over 16 years ago)

Proposed usabillity enhancement for PNG handling

Hi,

On Thu, 2008-10-16 at 09:00 +0200, Tobias Jakobs wrote:

I was able to reproduce the problem here, too. (Windows XP, Gimp 2.6.1) I created a new image with a transparent background painted some red strokes on it an saved it as PNG. Then I closed and reopened the image and saved it via File->Save As... (I just replaced the png with jpeg). Before that I set the background colour to green and the foreground colour to blue. The result was an image with an black background.

What option do you choose in the Export dialog when it asks you if the image should be flattened? The only way I can reproduce this is to click on "Ignore" here. And doing so is like asking GIMP to shoot you in the foot. Which is what the JPEG plug-in then happily does.

Sven

Tobias Jakobs
2008-10-16 10:33:45 UTC (over 16 years ago)

Proposed usabillity enhancement for PNG handling

On Thu, Oct 16, 2008 at 9:21 AM, Sven Neumann wrote:

Hi,

On Thu, 2008-10-16 at 09:00 +0200, Tobias Jakobs wrote:

I was able to reproduce the problem here, too. (Windows XP, Gimp 2.6.1) I created a new image with a transparent background painted some red strokes on it an saved it as PNG. Then I closed and reopened the image and saved it via File->Save As... (I just replaced the png with jpeg). Before that I set the background colour to green and the foreground colour to blue. The result was an image with an black background.

What option do you choose in the Export dialog when it asks you if the image should be flattened? The only way I can reproduce this is to click on "Ignore" here.

Yes, I clicked on "Ignore", it woks fine with "Export"

And doing so is like asking GIMP to shoot you in the foot. Which is what the JPEG plug-in then happily does.

What is the reason for the "Ignore" button? And is it really needed? I wasn't able to find anything in the help.

Apropos help, I was able to crash Gimp by clicking the "Help" button in the jpeg save dialog. But I'll discover this later, this evening on my Linux box, to provide a nice stack trace.

Regards, Tobias

Tobias Jakobs
2008-10-16 21:19:11 UTC (over 16 years ago)

Proposed usabillity enhancement for PNG handling

On Thu, Oct 16, 2008 at 10:33 AM, Tobias Jakobs wrote:

Apropos help, I was able to crash Gimp by clicking the "Help" button in the jpeg save dialog. But I'll discover this later, this evening on my Linux box, to provide a nice stack trace.

I'm not able to reproduce this on Linux. On Windows I used the online help and Firefox as browser.

Tobias

Sven Neumann
2008-10-17 09:04:30 UTC (over 16 years ago)

Proposed usabillity enhancement for PNG handling

Hi,

On Thu, 2008-10-16 at 10:33 +0200, Tobias Jakobs wrote:

What option do you choose in the Export dialog when it asks you if the image should be flattened? The only way I can reproduce this is to click on "Ignore" here.

Yes, I clicked on "Ignore", it woks fine with "Export"

And doing so is like asking GIMP to shoot you in the foot. Which is what the JPEG plug-in then happily does.

What is the reason for the "Ignore" button? And is it really needed? I wasn't able to find anything in the help.

"Ignore" skips the export step. So the image will end up in the plug-in without being altered in any way. This is sometimes useful, for example if you want to save a particular layer, and not the whole image. But it requires that you know what you are doing.

And no, I don't claim that this is a good user interface. It just happens to be like that and no one has started an overhaul yet, even though that is long overdue.

Sven