[Gimp-user] transparency

2010-03-24 Thread Claude Sancartier.
How can I bring back a eBook cover created with Gimp
to my desktop with a transparent background

Thank you

Claude

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Re: [Gimp-user] transparency

2008-04-27 Thread Jon Cosby
norman wrote:
 I have a photograph of a black hexagon on a white background and I would
 like to make the background transparent so that I can lay this onto
 another image. I have tried and not made much progress and would be
 grateful if some kind person could please point me in the right
 direction.
 
 Norman
 


Convert the image to RGB mode if it's not already. Select the white 
region by color. In the Layer - Transparency menu, add an alpha 
channel. In the same menu, set Color to alpha. This should make the 
white background to transparent.


Jon
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Re: [Gimp-user] transparency

2008-04-27 Thread norman

 Convert the image to RGB mode if it's not already. Select the white 
 region by color. In the Layer - Transparency menu, add an alpha 
 channel. In the same menu, set Color to alpha. This should make the 
 white background to transparent.

Thank you very much.

Norman

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Re: [Gimp-user] transparency

2008-04-27 Thread norman

 Convert the image to RGB mode if it's not already. Select the white 
 region by color. In the Layer - Transparency menu, add an alpha 
 channel. In the same menu, set Color to alpha. This should make the 
 white background to transparent.

I selected the white region by colour and in the Layer- Transparency
menu added an alpha channel. However, the set Colour to Alpha setting
remained greyed out of action. What have I missed, please?

Norman

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Re: [Gimp-user] transparency

2008-04-27 Thread Daniel Hornung
  Convert the image to RGB mode if it's not already. 

 However, the set Colour to Alpha setting 
 remained greyed out of action. What have I missed, please?

 Norman

Are you in RGB mode?  You can check it in Image-Mode.

Daniel


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Re: [Gimp-user] transparency

2008-04-27 Thread Jan Snyder
Like he said, changed it to RGB if it's not already. in the layers toolbox,
right click on the layer and in the menu that comes up click add alpha
channel. Then use the eraser tool on the area you want erased just to see
if it works.

On Sun, Apr 27, 2008 at 12:01 PM, norman [EMAIL PROTECTED] wrote:


  Convert the image to RGB mode if it's not already. Select the white
  region by color. In the Layer - Transparency menu, add an alpha
  channel. In the same menu, set Color to alpha. This should make the
  white background to transparent.

 I selected the white region by colour and in the Layer- Transparency
 menu added an alpha channel. However, the set Colour to Alpha setting
 remained greyed out of action. What have I missed, please?

 Norman

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Re: [Gimp-user] transparency

2008-04-27 Thread norman

 Are you in RGB mode?  You can check it in Image-Mode.

No, changed to RGB, problem solved, thank you.

Norman

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[Gimp-user] Transparency in a .png image

2006-10-31 Thread Olle Viksten
I have an image with a black background and red and yellow text.

I need to make the background transparent so I can upload it to a
T-shirt printer.

Maybe I'm having a blonde moment but I can't find anyway to do it. Not
in the menues and not on the net.

Can someone help me?

Olle
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Re: [Gimp-user] Transparency in a .png image

2006-10-31 Thread Andrew

Olle Viksten wrote:

I have an image with a black background and red and yellow text.

I need to make the background transparent so I can upload it to a
T-shirt printer.

Maybe I'm having a blonde moment but I can't find anyway to do it. Not
in the menues and not on the net.

  

I think the correct way is using Layer - Transparency - Colour to Alpha
or
Select - By Colour and then Layer - Transparency - Alpha to Selection

HTH

Andrew
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Re: [Gimp-user] Transparency in a .png image

2006-10-31 Thread Ismael Valladolid Torres
Olle Viksten escribe:
 I have an image with a black background and red and yellow text.
 
 I need to make the background transparent so I can upload it to a
 T-shirt printer.
 
 Maybe I'm having a blonde moment but I can't find anyway to do it. Not
 in the menues and not on the net.
 
 Can someone help me?

Use the color to alpha plug-in and ask him to make the black
background transparent. It'll only be difficult if you have other
black regions in your picture that you don't want to make
transparent. In that case, play with selections.

Cordially, Ismael
-- 
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[Gimp-user] Transparency

2002-11-07 Thread Volker . That
Hi !

I'm a newbie and have a - for me serious - problem:

I've a nice symbol with blue as background color. Now I want to replace the
blue with transparency. How can I do that easily ?

Thank you for any hint !!

Best regards,

Volker That
Germany


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Re: [Gimp-user] Transparency

2002-11-07 Thread Karl Auer
On Thu, 7 Nov 2002 08:32:50 +0100
[EMAIL PROTECTED] wrote:
 I've a nice symbol with blue as background color. Now I want to replace the
 blue with transparency. How can I do that easily ?

Add an alpha channel first (Image-Alpha-Add alpha channel, or via the Layers 
dialogue). Then use the magic wand (it's tool tip says select contiguous regions) 
and click somewhere on the background to select everything outside the symbol. Then 
use Edit-Cut to remove the background. This will only work if the entire area outside 
the symbol is one colour, though you can change the threshold to select more or less 
by double-clicking on the wand icon.

If you need to select areas inside the symbol as well, use Select-By color instead; 
click on a pixel that is the colour of the background, and everything of that colour 
in the entire image will be selected. Select by colour has a threshold slider too. 
When everything you want is is selected, use Edit-cut to remove it.

Then go read Grokking the Gimp :-)

Regards, K.

--
~~~
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Re: [Gimp-user] transparency in GIF

2001-07-23 Thread eric2work

can someone please tell me how to get transparency in GIF's..
thanks and sorry if RTFM but i've checked and can't see anything but reference to
it as supported...but how to turn on in final image?

As GIF is an indexed color format, gimp loads the gif in indexed color format. This
means you have a limited (max. 255) amount of colors to draw with. Other colors
simply does not exist unles you change one of the colors in the palette to the
disired color. Gimp cannot and may not change these colors, these colors are defined
by you. Transparency requires more colors, as colors from one layer are merged with
another layer to form the result. Therefore, in indexed color mode transparency is
not possible.

To use transparency, simply
1) load the image
2) convert the image to RGB (or grayscale)
3) do your transparency thingy
4) convert the image to indexed color
5) save as GIF

Eric.

note: I use the windows version with dutch locale





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[Gimp-user] transparency

2001-07-10 Thread Markus Klein

Hello.

I would like to put an image with transparency on my web-page. I saved it in 
png-format but navigator shows a white background of the image although gimp 
shows the image with transparent background when reopening the picture.
in gimp this picture is one simple layer.

i am sure that i didn't see the simple solution. could anybody please give me 
a hint ?

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Re: [Gimp-user] transparency

2001-07-10 Thread Rasputin

* Markus Klein [EMAIL PROTECTED] [010710 16:32]:
 Hello.
 
 I would like to put an image with transparency on my web-page. I saved it in 
 png-format but navigator shows a white background of the image although gimp 
 shows the image with transparent background when reopening the picture.
 in gimp this picture is one simple layer.
 
 i am sure that i didn't see the simple solution. could anybody please give me 
 a hint ?

Netscape has very ropey support for PNG format images.
Save as GIF?
(I know that's not really a fix, but it's that or one of those awful
You need ot use IE to view this webpage popups. Yuk.
-- 
Disclaimer: These opinions are my own, though for a small fee they be
yours too.
-- Dave Haynie
Rasputin :: Jack of All Trades - Master of Nuns ::
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Re: [Gimp-user] transparency with png

2001-03-15 Thread Uwe Koloska

Am Montag, 12. Mrz 2001 21:59 hast du geschrieben:
 If you want fading to backgroud, you are basically out of luck until PNGs
 are more fully supported.  (GIFs don't work because it only has
 transparency on or off, no fading).

 What I now do is have a GIMP XCF file with the "top" layer fading to
 transparent as I want, and a background layer that I can change at will.
 Thus for my pale yellow backround web pages, I can creat a new
 non-transparent JPEG which fades to my pale yellow.  For a white
 background, I create another JPEG which fades to white, etc.

 This isn't ideal, for all of the obvious reasons, but it does work for
 most usages.

There is a better workaround since we have true transparency for web 
images.  It has the disadvantage to only work with simple backgrounds, 
though.

there are two layers: one with your image an one with the (simple) 
background of the webpage.

Then "alpha - selection" and save the selection into a channel.

combine the two layers.

invert the selection (after you get it back from the channel) and cut the 
background.

Then you have a simple alpha, a region where the alpha fading is combined 
with the background and the picture.

Now there is only the problem to convert the RGB image to indexed.  The 
advantage:  There is no border between the image and the webpage background 
(sometimes image colors are different from the same colors in images).

Uwe

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Re: [Gimp-user] transparency with png

2001-03-12 Thread Carl Constantine

On 3/12/2001 06:58, Jason P. Holland at [EMAIL PROTECTED] wrote:

 Thanks for the quick response.  In IE 5.5, the background is light blue.  In
 netscape 4.76 on my linux box, its black.  the graphic is at
 http://jholland.nichware.net/alivepreview.html.  i have no clue.  seems like
 it would work.  thanks for the help.

It appears properly in MSIE 5.0 on the Mac. Netscape has a black background.

I would hazard to guess that MSIE 5.5 on Winblows isn't fully alpha-png
compatible just as suggested by Rebecca Walter. It must be supported in the
browser for it to work.


-- 

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Re: [Gimp-user] transparency with png

2001-03-12 Thread Arcady Genkin

"Jason P. Holland" [EMAIL PROTECTED] writes:

 Thanks for the quick response.  In IE 5.5, the background is light blue.  In
 netscape 4.76 on my linux box, its black.  the graphic is at
 http://jholland.nichware.net/alivepreview.html.  i have no clue.  seems like
 it would work.  thanks for the help.

Just for the record, Mozilla 0.8 displays the transparency correctly.

Most browsers can handle regular (non-transparent) png's (apart from
MS IE 4.x under Mac, IIRC).  Very few have correct support for png
transparency, sadly...
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RE: [Gimp-user] transparency with png

2001-03-12 Thread Jeffrey Goldberg

On Mon, 12 Mar 2001, Jason P. Holland wrote:

 [...]  Why would it behave this way?

Appearently full PNG support is uneven in browsers.

 i could use jpg, but i like the quality of png better.

And JPEG doesn't support any transparency.

If you want fading to backgroud, you are basically out of luck until PNGs
are more fully supported.  (GIFs don't work because it only has
transparency on or off, no fading).

When I first joined this list, I was asking about fading to transparent
for the web.  And have given up.

What I now do is have a GIMP XCF file with the "top" layer fading to
transparent as I want, and a background layer that I can change at will.
Thus for my pale yellow backround web pages, I can creat a new
non-transparent JPEG which fades to my pale yellow.  For a white
background, I create another JPEG which fades to white, etc.

This isn't ideal, for all of the obvious reasons, but it does work for
most usages.

Someone who'd bothered to learn GIMP scripting could even script the
generation of different versions each with a fade to a new background

-j

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I have recently moved, see http://www.goldmark.org/jeff/contact.html
Relativism is the triumph of authority over truth, convention over justice

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Re: [Gimp-user] transparency with png

2001-03-12 Thread Seth Burgess

There's a couple of scripts that take a background
color (or layer) and make a thin halo around your
transparent image.  This won't make a smooth gradient,
but if you have some idea what your background is
going to be it looks great.  Even against a patterned
background the human eye is quite forgiving. 

The 2 I know offhand (I wrote one) are prep4gif and
alphaGif.

Happy GIMPing,

Seth Burgess
[EMAIL PROTECTED]

--- Bill Lee [EMAIL PROTECTED] wrote:
 Carl Constantine wrote:
  
  On 3/12/2001 07:35, Carl Constantine at
 [EMAIL PROTECTED] wrote:
  
   On 3/12/2001 06:58, Jason P. Holland at
 [EMAIL PROTECTED] wrote:
  
   Thanks for the quick response.  In IE 5.5, the
 background is light blue.  In
   netscape 4.76 on my linux box, its black.  the
 graphic is at
   http://jholland.nichware.net/alivepreview.html.
  i have no clue.  seems like
   it would work.  thanks for the help.
  
   It appears properly in MSIE 5.0 on the Mac.
 Netscape has a black background.
  
   I would hazard to guess that MSIE 5.5 on
 Winblows isn't fully alpha-png
   compatible just as suggested by Rebecca Walter.
 It must be supported in the
   browser for it to work.
  
  
  I just thought of another approach, since the
 graphic looks quite nice with
  the exception of the boarder around the main
 image, you can always try
  cropping the image so there is no
 boarder/background. Then it won't matter
  what browser you use, it will look correct.
  
  --
 


  __   _
   Carl B. Constantine
 / /  (_)__  __   __
[EMAIL PROTECTED]
/ /__/ / _ \/ // /\ \/ /  (2.4.1)   
 ICQ: 26351441
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  PGP
 key available on request
 


  
Up the line - out the server- past the firewall
 - nothing but Net!!
 
 This approach works just fine unless the image has
 rounded corners, as many of
 mine do. Cropping leaves you with a rectangular
 image which, without a
 transparent background, causes annoying white (or
 whatever your background color
 is) artifacts outside the rounded corners.
 
 Regards,
 
 Bill Lee
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