A case against JPG - Page 7 - Tech Support Forums

duckhunter-deux · July 13th, 2005, 08:31 AM

DanU is right about the JPEG size/accuracy ratio compared to some PNG images for online display. I use PNG for all my images, and normally use that format when I upload an image to DeviantArt. However, sometimes the PNG will be 3MB, while the JPEG only 320KB. In order to get the PNG down to JPEG size, I have to either lower the resolution or actual image size (neither of which I like doing). For the sake of those using dial-up, I'll upload the JPEG, while keeping the PNG for myself. Sometimes it's the other way around though, where the PNG is smaller. It really just depends on the image and what is involved in the image.

OuTpaTienT · July 13th, 2005, 08:31 AM

Here's the code that needs to go in the <head> portion of the page code to force IE to display pngs correctly:

Code:

<!--[if gte IE 5.5000]>
<script language="JavaScript">
function correctPNG() // correctly handle PNG transparency in Win IE 5.5 or higher.
   {
   for(var i=0; i<document.images.length; i++)
      {
	  var img = document.images[i]
	  var imgName = img.src.toUpperCase()
	  if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
	     {
		 var imgID = (img.id) ? "id='" + img.id + "' " : ""
		 var imgClass = (img.className) ? "class='" + img.className + "' " : ""
		 var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
		 var imgStyle = "display:inline-block;" + img.style.cssText 
		 if (img.align == "left") imgStyle = "float:left;" + imgStyle
		 if (img.align == "right") imgStyle = "float:right;" + imgStyle
		 if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle		
		 var strNewHTML = "<span " + imgID + imgClass + imgTitle
		 + " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
	     + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
		 + "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>" 
		 img.outerHTML = strNewHTML
		 i = i-1
	     }
      }
   }
window.attachEvent("onload", correctPNG);
</script>
<![endif]-->

ry4n · July 13th, 2005, 02:09 PM

Us Web guys have enough code to worry about, why haven't Microsoft fixed this yet? Is there some kind of grudge towards the company who coded the PNG?

OuTpaTienT · July 13th, 2005, 02:11 PM

Well you don't always have to include all that code. You can just place it in a file then call the file from the html document.

CookieBox Inc. · July 21st, 2005, 08:15 PM

oh wow, and i thought C++ was hard O_o

FreedomDesign · November 10th, 2005, 10:00 PM

Considering the fact that most of the lemming public dosent even have their monitors set up for correct color or resolution, and do not have a real eye for correct color or res. I dont see any point in using png files on the web and going thru the hassle of MORE freakin javascript. Jpegs are more than fine for Harry and the Hendersons.
I do agree that png is far and away better for image archiving. I personally tend to use TIFF with LZW compression, but this is mostly a habit formed from years of working with different rips commonly used by printing company's graphic departments. Most rips in the past couldnt rip a PNG to save a life, and had trouble with jpegs as well. I have heard that they are comming around though.

kenboyles72 · November 10th, 2005, 10:36 PM

i've have known about the distortion of pics being converted to jpg for some time now. most of my pics that i have saved is in bmp or png format. i agree with you completely about having png formats recognized by IE. the png format is the best overall, IMO, small file size with good quality. png isnt new, its been around for a while. dont see why some of these idiots haven't come to realize the superior qualities of png against jpg files. maybe only becuase most apps utilize the jpg fomat more. so what? come on people, get with the program, jeeez.

Bizkitkid2001 · November 10th, 2005, 10:39 PM

Hey OuT, since this thread was bumped up, I was wondering if you ever got around to updating this article?

I remember PMing you somthing that had to do with this article but it was so long ago that I forgot what I told you.

aznlurkerz · December 14th, 2005, 05:59 AM

awesome post!

hatehotmail · December 14th, 2005, 08:49 AM

PNG it is

Quote:

Originally Posted by CookieBox Inc.

oh wow, and i thought C++ was hard O_o

haha