Guest nazcaLine Posted April 4, 2006 Share Posted April 4, 2006 hi guys i recently downloaded some tree images from http://www.howardmodels.com/0-tree/...12103/index.htm and i want to use them for my 3d images. how can i create an alpha chanel so all white turns transparent? i tried selecting white with color range but results were not good at all, even adjusting fuzzines. i also tried changing the blend mode to multiply and it turned all white transparent BUT the tree looked bad. how can i turn the white of that image into an alpha channel?? please help!!!!! Link to comment Share on other sites More sharing options...
DennisHolland Posted April 5, 2006 Share Posted April 5, 2006 The fastest way to make a tree standalone is to open the image in Photoshop, copy your background layer > pick the magic wand and uncheck contigious so all white will be selected > press delete. Need a few tests, best is to make a layer under your tree totally black to see if you set the tolerance right. There are also some tools on the market such as Fluid, but that is very timeconsuming and irritating. Link to comment Share on other sites More sharing options...
William Alexander Posted April 6, 2006 Share Posted April 6, 2006 Yes you can do as dennis says...it works-yes and no, imho Best way is always to try using channels first as the base of your new mask. Blue channel is normally the best. You can copy that channel in the channels tab and apply a levels adjustment from the main menu image drop downlist and adjust the sliders so you have pure white and black. Then drop the improved channel on the slection button....go to the layers tab and use the slection as a mask then invert it. Using calculations is really cool too. Screen two blue channels result = a new channel. A quick levels adjustment (as above) 2 minutes done...example shown. would need to cover the hole in the trunk-paint the mask you can even use the levels adjustment (drop down menu) on the mask to getter a better fit. WDA Link to comment Share on other sites More sharing options...
DennisHolland Posted April 6, 2006 Share Posted April 6, 2006 Even better. When you're finished with the standalone technique, select all with the wand and contract 1 pixel > select inverse and hit delete to get rid of any bad leftovers... Have that verified as well, please? Dennis Link to comment Share on other sites More sharing options...
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