Transparent background in JPEG image

Question

How can I set a transparent background on JPEG image  This is a doubt of many colleagues of mine   What would be the solution using Paint on Windows   What are the other simple alternatives

User · Answer

JPG does not support a transparent background  you can easily convert it to a PNG which does support a transparent background by opening it in near any photo editor and save it as a PNG

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If you   re concerned about the file size of a PNG  you can use an SVG mask to create a transparent JPEG  Here is an example I put together

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You can t make a JPEG image transparent  You should use a format that allows transparency  like GIF or PNG   Paint will open these files  but AFAIK it ll erase transparency if you edit the file  Use some other application like Paint NET  it s free    Edit  since other people have mentioned it  you can convert JPEG images into PNG  in any editor that s capable of working with both types

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JPG doesn t support transparency

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JPEG can t support transparency because it uses RGB color space  If you want transparency use a format that supports alpha values  Example PNG is an image format that uses RGBA color space where  r   red  g   green  b   blue  a   alpha value   Alpha value is used as an opacity measure  0  is fully transparent and  100  is completely opaque  pixel

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How can I set a transparent background on JPEG image    If you intend to keep the image as a JPEG then you can t  As others have suggested  convert it to PNG and add an alpha channel

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Just wanted to add that GIF  transparency  is more like missing pixels   If you use GIF then you will see jagged edges where the background and the rest of the image meet   Using PNG  you can smoothly  composite  images together  which is what you really want   Plus PNG supports highly quality images   Don t use  Paint     There are many high quality art applications for doing art work   I think even the cell phone apps  Pixlr is pretty good and free   and web-based image editting apps are better    I use Gimp - free for all platforms   While a JPEG can t be made transparent in and of itself  if your goal is to reduce the size of very large image areas for the web that need to contain transparent image areas  then there is a solution   It s a bit too complicated to post details  but Google it   Basically  you create your image with transparency and then split out the alpha channel  Gimp can do this easily  as a simple 8-bit greyscale PNG   Then you export the color data as a JPG   Now your web page uses a CANVAS tag to load the JPG as image data and applies the 8-bit greyscale PNG as the Canvas s alpha channel   The browser s Canvas does the work of making the image transparent   The JPEG stores the color info  better compressed than PNG  and the PNG is reduced to 8-bit alpha so its considerably smaller    I ve saved a few hundred K per image using this technique   A few people have proposed file formats that embed PNG transparency info into a JPEG s extended information fields  but these proposal s don t have wide support as of yet

[image] Transparent background in JPEG image

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