Re: [Gimp-user] Colour swapping advice

2014-12-29 Thread rich
Chris1968  gimpusers.com> writes:


> 
> Sorry, forgot to add, absolute noob with Gimp.
> 


I wonder how many actually looked at your image. It is very small, so do not 
expect a great result. Hope you have a larger, better version.

First thing, it is grayscale and to do any work on it, change the mode to RGB 
(Image menu -> Mode).

As previous posts, Colors menu -> Color-to-Alpha will remove the gray 
background, even using the default setting, and a Layer menu -> Transparency -
> Alpha-to-Selection will then select the pentagram for filling with a new 
colour.

Big but...The quality of the posted jpeg is horrible, lots of artifacts 
resulting in semi-transparent pixels all over. Tweaking with the curves tool 
will improve the image. The only real way is to re-draw using the original as 
a template. Not difficult, several ways to do it.
Using an old netbook and Gimp 2.6, in a few minutes while watching TV. Could 
be better.
http://www.mediafire.com/view/dlc0ygm1ffcdv3w/penta.xcf
The top layer is plain, a second layer has been bumpmapped to give a more 
'golden' effect.
Too many jaggies, that is what happens with small (200x200 pix) images.

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Re: [Gimp-user] Colour swapping advice

2014-12-28 Thread akovia
You might want to try using color to alpha.
Colors > Color to Alpha

To fine tune it you can use the curves tool.

Something like this maybe.
https://dl.dropboxusercontent.com/u/93550827/temp/c2a.ogv

On Sun, Dec 28, 2014, at 06:27 AM, Chris1968 wrote:
> Hi all,
> 
> I am planning to build a website over the coming weeks but I want to make
> some
> custom images albeit slightly basic ones. My first image project would be
> the
> banner for the home page for which I already have an image which I will
> attach
> to this post.
> 
> It is a simple two colour image of a pentagram. The pentagram is black
> against a
> white background but I want to change the black to a shade of gold maybe
> and the
> background to a shade of black. Rather that editing it pixel by pixel
> there must
> be an easier way by using gimp to alter the pentagram's colour and the
> background colour.
> 
> Any help greatly appreciated.
> 
> Chris
> 
> Attachments:
> * http://www.gimpusers.com/system/attachments/182/original/pentagram.jpg
> 
> -- 
> Chris1968 (via www.gimpusers.com/forums)
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-- 
  akovia
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Re: [Gimp-user] Colour swapping advice

2014-12-28 Thread Alexandre Prokoudine
28 дек. 2014 г. 18:59 пользователь "Chris1968" 
написал:

> It is a simple two colour image of a pentagram. The pentagram is black
against a
> white background but I want to change the black to a shade of gold maybe
and the
> background to a shade of black. Rather that editing it pixel by pixel
there must
> be an easier way by using gimp to alter the pentagram's colour and the
> background colour.

Can't lay my hands on GIMP to try right now, but could
http://docs.gimp.org/en/plug-in-exchange.html be worth a shot?

Alex
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Re: [Gimp-user] Colour swapping advice

2014-12-28 Thread Ofnuts

On 28/12/14 12:27, Chris1968 wrote:

Hi all,

I am planning to build a website over the coming weeks but I want to make some
custom images albeit slightly basic ones. My first image project would be the
banner for the home page for which I already have an image which I will attach
to this post.

It is a simple two colour image of a pentagram. The pentagram is black against a
white background but I want to change the black to a shade of gold maybe and the
background to a shade of black. Rather that editing it pixel by pixel there must
be an easier way by using gimp to alter the pentagram's colour and the
background colour.

Any help greatly appreciated.

Chris

Attachments:
* http://www.gimpusers.com/system/attachments/182/original/pentagram.jpg



When doing an image from scratch, the basic principle in Gimp it to work 
with layers, keeping objects in their own layer (the reste of the layer 
being transparent) so that they can be altered at will without impacting 
the rest of the image. If the pentagram is in its own layer, then 
changing its color is just alpha-locking the layer and bucket-filling it 
with the new color (due to alpha-lock, all pixels keep their original 
opacity/transparency), and the background color can be changed by simple 
bucket-fill.

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