: What's the easiest way to convert a .jpg image with white background into .png with alpha channel? example .jpg: Ideal .png result:

@Connie430

If you use GIMP, I can suggest this tutorial: Perfect masking using a highpass guide.
I had very good results with complex images by following it.

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@Welton168

For the sake of completion i had to add one more method (if you using photoshop). As your image is not complex you can use the magic wand, or select color. But best method for separating a complex foreground from a relatively less complex background is Channel masking.

Here is a good tutorial which might be helpful for future visitors: graphics.tutremix.com/tutorials/photo-effect/how-to-make-a-lightning-man-photomanipulation-in-photoshop-day-1/

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@Holmes874

Command line is quicker. Install Imagemagick.

One file:

convert -transparent white whatever.jpg whatever.png


More files:

Put together a bash script file:

for img in *.jpg; do
filename=${img%.*}
convert -transparent white "$filename.jpg" "$filename.png"
done


Run it and then you will be done. Note that the above will add transparency to everything that is white 'FFFFFF' including any pixels of that colour inside your image. "topLeftPixel" can be used instead of "white" for autodecting background colour.

If the white pixels in image problem is a problem then you can do Photoshop batch. Layer mask is better than 'delete'-clearing the white pixels as you do not actually alter the RGB layers.

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@Si6392903

It depends on the software you have available to you.

If you have Photoshop, for an image that clean you can do it very quickly:


Open the file.
Double-click the Background layer to convert it to a normal layer.
Use Magic Wand (w) (low Tolerance and Contiguous and Anti-alias checked) to select the white background.
Press Delete key to clear the selection.
Save as a PNG or Save-for-web as PNG.


If you get a white halo around your image, try using menu Select ⇒ Modify ⇒ Expand (with 1-2px setting) after step 3.

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