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making scanned drawings transparent

 
 
CTJDavies
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      01-08-2004, 08:35 PM
Hi there,
I have scanned some technical drawings that I'd like to build in to my webpage.
I would like to convert the white background to transparent to let the
background colour of my webpage be seen behind the drawing. How do I do that?
Any help is appreciated.
 
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Glenn
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      01-08-2004, 09:29 PM
A little cheat is to change the white backgound to the color of your web
page background.



"CTJDavies" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hi there,
> I have scanned some technical drawings that I'd like to build in to my

webpage.
> I would like to convert the white background to transparent to let the
> background colour of my webpage be seen behind the drawing. How do I do

that?
> Any help is appreciated.



 
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mike
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      01-08-2004, 09:35 PM
in article (E-Mail Removed), CTJDavies at
(E-Mail Removed) wrote on 1/8/04 12:35 PM:

> Hi there,
> I have scanned some technical drawings that I'd like to build in to my
> webpage.
> I would like to convert the white background to transparent to let the
> background colour of my webpage be seen behind the drawing. How do I do that?
> Any help is appreciated.



Change the white to the same color as your web page.

duh...

 
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CTJDavies
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      01-08-2004, 10:19 PM
>From: mike (E-Mail Removed)

>Change the white to the same color as your web page.
>
>duh...
>


ok...been there, done that!
I'm building my webpage using Netscape Composer. I edit my graphics with
Photoshop. I tried changing the background colour of my plans to the colour of
my webpage, but even if I get the reds, greens and blue dead on as far as the
numbers go, there always is a (more than) slight difference when viewing the
page using Netscape.
That didn't quite work as good as I thought it would.
Making the background transparent would be great. That way I could just place
the drawing into Netscape.
 
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Debeuf Nikolaas
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      01-08-2004, 10:32 PM
Are you using the monitors RGB -sRGB IEC61966-2.1 working space
for both your websitebackground and your graphic ?
Normally the colors should be consistant.
If not, you can convert the colorspace of both your images
into the same workspace as written above.

hope this helps

"CTJDavies" <(E-Mail Removed)> schreef in bericht
news:(E-Mail Removed)...
> >From: mike (E-Mail Removed)

>
> >Change the white to the same color as your web page.
> >
> >duh...
> >

>
> ok...been there, done that!
> I'm building my webpage using Netscape Composer. I edit my graphics with
> Photoshop. I tried changing the background colour of my plans to the

colour of
> my webpage, but even if I get the reds, greens and blue dead on as far as

the
> numbers go, there always is a (more than) slight difference when viewing

the
> page using Netscape.
> That didn't quite work as good as I thought it would.
> Making the background transparent would be great. That way I could just

place
> the drawing into Netscape.



 
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Jon Zickfeldt
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      01-08-2004, 10:56 PM
CTJDavies <(E-Mail Removed)> wrote:

> >From: mike (E-Mail Removed)

>
> >Change the white to the same color as your web page.
> >
> >duh...
> >

>
> ok...been there, done that!
> I'm building my webpage using Netscape Composer. I edit my graphics with
> Photoshop. I tried changing the background colour of my plans to the colour of
> my webpage, but even if I get the reds, greens and blue dead on as far as the
> numbers go, there always is a (more than) slight difference when viewing the
> page using Netscape.
> That didn't quite work as good as I thought it would.
> Making the background transparent would be great. That way I could just place
> the drawing into Netscape.


How about exporting to .PNG ? Are U using PS, you`ll find it under
"help">Export transparant. First you have to select the area to be made
transparent...

Jon
 
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mike
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      01-08-2004, 11:30 PM
in article (E-Mail Removed), CTJDavies at
(E-Mail Removed) wrote on 1/8/04 2:19 PM:

>> From: mike (E-Mail Removed)

>
>> Change the white to the same color as your web page.
>>
>> duh...
>>

>
> ok...been there, done that!


No you have not done that.

If you use a little square of color from the background of your drawings and
use that little square of color as your background on your web page then
there can be no difference in the colors.

DUH.



 
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Hecate
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      01-09-2004, 01:36 AM
On Thu, 8 Jan 2004 23:56:10 +0100, (E-Mail Removed)kdette (Jon
Zickfeldt) wrote:

>CTJDavies <(E-Mail Removed)> wrote:
>
>> >From: mike (E-Mail Removed)

>>
>> >Change the white to the same color as your web page.
>> >
>> >duh...
>> >

>>
>> ok...been there, done that!
>> I'm building my webpage using Netscape Composer. I edit my graphics with
>> Photoshop. I tried changing the background colour of my plans to the colour of
>> my webpage, but even if I get the reds, greens and blue dead on as far as the
>> numbers go, there always is a (more than) slight difference when viewing the
>> page using Netscape.
>> That didn't quite work as good as I thought it would.
>> Making the background transparent would be great. That way I could just place
>> the drawing into Netscape.

>
>How about exporting to .PNG ? Are U using PS, you`ll find it under
>"help">Export transparant. First you have to select the area to be made
>transparent...
>

No. Use gif unless you want everyone using IE to be unable to see the
graphic.

If the background is white then it's a trivial matter to make the
image into a layer, then select white and delete it. It's all in the
help files/manual.


--

Hecate
(E-Mail Removed)
veni, vidi, reliqui
 
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steven
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      01-09-2004, 01:51 AM
OK Mr. Duh, you're squabbling over the wrong issue. Replacing the white
with some background color is not what he wants to do, so just let it go...
Besides, it takes a lot of work to redo all your pictures if you decide to
change your background.

In answer to the question, it would probably be best to save your pictures
in .gif format, which supports transparency. You said they are technical
drawings, so I assume they are not color intensive (.gifs have a 256 color
limit). I would recommend .png, except that as far as I've seen, the
transparency doesn't work in Internet Explorer.

So, to convert:

Image > Mode > Indexed Color. There are a couple of options for choosing
the color palette. You can play with those, but make sure Transparency is
checked.

Image > Mode > Color Table. This shows the palette of colors you chose.
Select the eyedropper, then click the color on the image itself that you
want to be transparent (in this case, the white background). This will
change everything that is that color in the image transparent, so be careful
there is not white somewhere in the interior that you want to remain opaque.

File > Save As > technicaldrawing.gif

Or if you're really adventurous, you can try "File > Save for Web". There
are more options for optimizing .gif files there.

As for DuhMike, I guess ignorance is not bliss, huh?

-Steven



"mike" <(E-Mail Removed)> wrote in message
news:BC232826.C8BE4%(E-Mail Removed)...
> in article (E-Mail Removed), CTJDavies at
> (E-Mail Removed) wrote on 1/8/04 2:19 PM:
>
> >> From: mike (E-Mail Removed)

> >
> >> Change the white to the same color as your web page.
> >>
> >> duh...
> >>

> >
> > ok...been there, done that!

>
> No you have not done that.
>
> If you use a little square of color from the background of your drawings

and
> use that little square of color as your background on your web page then
> there can be no difference in the colors.
>
> DUH.
>
>
>



 
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Combaticus
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      01-09-2004, 02:19 AM
in article fOnLb.1786$8H.9963@attbi_s03, steven at (E-Mail Removed) wrote
on 1/8/04 5:51 PM:

> OK Mr. Duh, you're squabbling over the wrong issue. Replacing the white
> with some background color is not what he wants to do...



He wants his drawing's background to match his web page backgrounds.

Easy.

Grab a chunk of the background color from the graphic and make that color
your web page color.

Easy.

Now move on.

":^) ®


 
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