What is difference between png8 and png24

Question

I want to know about uses of png files  There are two formats available for png images  one is png8 and the another one is png24    I would like to know that if I use either type in my html page  will there be any error  Or is this only quality matter

User · Answer

The main difference is that a 8-bit PNG comprises a max  of 256 colours  like GIFs  PNG-24 is a lossless format and can contain up to 16 million colours

User · Answer

You have asked two questions  one in the title about the difference between PNG8 and PNG24  which has received a few answers  namely that PNG24 has 8-bit red  green  and blue channels  and PNG-8 has a single 8-bit index into a palette   Naturally  PNG24 usually has a larger filesize than PNG8   Furthermore  PNG8 usually means that it is opaque or has only binary transparency  like GIF   it s defined that way in ImageMagick GraphicsMagick   This is an answer to the other one   I would like to know that if I use either type in my html page  will there be any error  Or is this only quality matter    You can put either type on an HTML page and no  this won t cause an error  the files should all be named with the   png  extension and referred to that way in your HTML   Years ago  early versions of Internet Explorer would not handle PNG with an alpha channel  PNG32  or indexed-color PNG with translucent pixels properly  so it was useful to convert such images to PNG8  indexed-color with binary transparency conveyed via a PNG tRNS chunk  -- but still use the  png extension  to be sure they would display properly on IE   I think PNG24 was always OK on Internet Explorer because PNG24 is either opaque or has GIF-like single-color transparency conveyed via a PNG tRNS chunk   The names PNG8 and PNG24 aren t mentioned in the PNG specification  which simply calls them all  PNG    Other names  invented by others  include   PNG8 or PNG-8  indexed-color with 8-bit samples  usually means opaque or with GIF-like  binary transparency  but sometimes includes translucency  PNG24 or PNG-24  RGB with 8-bit samples  may have GIF-like transparency via tRNS  PNG32  RGBA with 8-bit samples  opaque  transparent  or translucent  PNG48  Like PNG24 but with 16-bit R G B samples  PNG64  like PNG32 but with 16-bit R G B A samples    There are many more possible combinations including grayscale with 1  2  4  8  or 16-bit samples and indexed PNG with 1  2  or 4-bit samples  and any of those with transparent or translucent pixels   but those don t have special names

User · Answer

From the Web Designer   s Guide to PNG Image Format     PNG-8 and PNG-24      There are two PNG formats  PNG-8 and PNG-24  The numbers are shorthand   for saying  8-bit PNG  or  24-bit PNG   Not to get too much into   technicalities     because as a web designer  you probably don   t care       8-bit PNGs mean that the image is 8 bits per pixel  while 24-bit PNGs   mean 24 bits per pixel       To sum up the difference in plain English  Let   s just say PNG-24 can   handle a lot more color and is good for complex images with lots of   color such as photographs  just like JPEG   while PNG-8 is more   optimized for things with simple colors  such as logos and user   interface elements like icons and buttons       Another difference is that PNG-24 natively supports alpha   transparency  which is good for transparent backgrounds  This   difference is not 100  true because Adobe products    Save for Web   command allows PNG-8 with alpha transparency

User · Answer

Basic difference   a 8-bit PNG comprises a max  of 256 colors  PNG-24 is a loss-less format and can contain up to 16 million colors    Impacts    If you are using any round corner image then edges might visible in png8 format  ie6 doesnt support png24 format

User · Answer

There is only one PNG format  but it supports 5 color types   PNG-8 refers to palette variant  which supports only 256 colors  but is usually smaller in size  PNG-8 can be a GIF substitute   PNG-24 refers to true color variant  which supports more colors  but might be bigger  PNG-24 can be used instead of JPEG  if lossless image format is needed   Any modern web browser will support both variants

User · Answer

While making image with fully transparent background in PNG-8  the outline of the image looks prominent with little white bits  But in PNG-24 the outline is gone and looks perfect  Transparency in PNG-24 is greater and cleaner than PNG-8   PNG-8 contains 256 colors  while PNG-24 contains 16 million colors   File size is almost double in PNG-24 than PNG-8

[html] What is difference between png8 and png24

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