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Convert image to Transparent background


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#1 fstieglitz

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Posted 10 June 2010 - 04:14 PM

Hello. I searched this forum (and probably missed it) but I could not find the correct method, so i will go ahead and ask.

A 3rd party provided me a PNG file of a hand-drawn image with a white background.

What is the best way to convert this image so that all the white areas are really transparent?

Many thanks.
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#2 ptuZ

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Posted 10 June 2010 - 05:40 PM

use the Magic Wand :MagicWandTool: to select the white areas and then delete :)
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#3 pyrochild

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Posted 10 June 2010 - 08:12 PM

use the Magic Wand :MagicWandTool: to select the white areas and then delete :)

This will likely result in jaggies and stray almost-but-not-quite-white pixels around the edges of the lines.


Search the Tutorials forum for things relating to Alpha Mask(ing) for a cleaner solution.
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#4 Reinhard

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Posted 13 June 2010 - 04:17 PM

I use the Bucket (fill) with a full transparent color. 

You have to change the tool parameters from "Normal blend" to "Overwrite" in advance, or you won't see any effect. 

You can access the parameters after choosing the bucket. Press the little chemical bottle icon, in the right to the fill tolerance slider.


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#5 csm725

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Posted 13 June 2010 - 04:21 PM

See my tutorial:
Remove white background and preserve transparency

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#6 Ego Eram Reputo

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Posted 14 June 2010 - 12:25 AM

AlphaSpace plugin, or probably more accurate for your needs is the
Isolate Lineart plugin.

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#7 fstieglitz

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Posted 26 June 2010 - 02:44 PM

Many thanks to all. I will dive in head first and reply with my progress.
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#8 SquireDude

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Posted 11 December 2010 - 05:56 PM

I use the Bucket (fill) with a full transparent color.

You have to change the tool parameters from "Normal blend" to "Overwrite" in advance, or you won't see any effect.

You can access the parameters after choosing the bucket. Press the little chemical bottle icon, in the right to the fill tolerance slider.




How do you change the Bucket to Transparent color?

How do you make the Bucker Transparent color?
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#9 Ego Eram Reputo

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Posted 12 December 2010 - 01:08 AM

On the Color Window, click the More button.

The Transparency - Alpha slider is the one that affects the transparency of the currently selected color. 255 = fully opaque, 0 = fully transparent.

Note that transparency is indicated by the grey & white checkerboard pattern.
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#10 Xansky

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Posted 05 May 2011 - 11:39 PM

I use the Bucket (fill) with a full transparent color.

You have to change the tool parameters from "Normal blend" to "Overwrite" in advance, or you won't see any effect.

You can access the parameters after choosing the bucket. Press the little chemical bottle icon, in the right to the fill tolerance slider.




This worked for me, thanks!
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#11 Ego Eram Reputo

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Posted 06 May 2011 - 12:16 AM

This thread has been revived twice now. Let's put a stake through it's heart and let it die....,

<locked - [topic="2932/#11"]Rule #11[/topic]>
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