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Old November 3rd, 2008, 09:49 PM   Digg it!   #1 (permalink)
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White to transparent

I have an image (attached), which I'd like to remove the white into a transparent background as it will be going onto another background that I want to show through the image. How can I achieve this?
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white-transparent-720px-eeg_theta.svg.png  
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Old November 3rd, 2008, 10:05 PM     #2 (permalink)
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Very easy with photoshop.

I can not remember the exact name of the tool, but you can select a color range with it (under select->color range?). Just use it to select the white and delete it.
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Old November 3rd, 2008, 10:07 PM     #3 (permalink)
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Magic eraser and the background eraser will do the trick in photoshop
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Old November 5th, 2008, 06:16 AM     #4 (permalink)
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To do this correctly, not only do you need to delete the white color but you also need to know what color background it will be placed over. You need to save the new image as a .GIF with transparency and set it's MATTE color to the intended background color.
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Old November 5th, 2008, 08:02 AM     #5 (permalink)
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I managed to do it, can't remember what tool I used though. I went into color range, but couldn't seem to 'delete' it. I might have used the magic wand tool and cut it onto a new layer with a transparent background via .GIF

It's quite an important skill... I've always found myself cutting away backgrounds etc with PS
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Old November 18th, 2008, 11:33 PM     #6 (permalink)
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You can use the magic wand tool if and just mess with the tolerance until you get the area you'd like to cut away selected, then just hit delete! Save it as a .png to preserve the transparent background.
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Old November 19th, 2008, 12:08 AM     #7 (permalink)
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Old November 20th, 2008, 02:17 AM     #8 (permalink)
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Quote:
Originally Posted by OuTpaTienT View Post
To do this correctly, not only do you need to delete the white color but you also need to know what color background it will be placed over. You need to save the new image as a .GIF with transparency and set it's MATTE color to the intended background color.

Can I ask why? Would it just be more crisper? If you're overlaying it and it's completely transparent then how would that work better? I've never done it that way, but if it's worth doing then I'll be changing my ways.
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Old November 20th, 2008, 04:14 AM     #9 (permalink)
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Quote:
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Can I ask why? Would it just be more crisper? If you're overlaying it and it's completely transparent then how would that work better? I've never done it that way, but if it's worth doing then I'll be changing my ways.

Look at these images, read the text I inserted into them, and hopefully that should explain it. If not, ask me to clarify.
Attached Thumbnails
white-transparent-transparentthing1.png  white-transparent-transparentthing2.png  white-transparent-transparentthing3.png  
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Old November 20th, 2008, 01:53 PM     #10 (permalink)
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Quote:
Originally Posted by OuTpaTienT View Post
Look at these images, read the text I inserted into them, and hopefully that should explain it. If not, ask me to clarify.

I just learned something today...
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