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Mac Forum / Applications / PowerPoint / October 2007PNG vs. JPG?
I recently learned that the "png" file format exists. Can someone tell me how png differs from jpg and why I'd use one vs. the other in PowerPoint (2003)? Does it affect file size, usability, or what? Thanks in advance. LizaJane90 I've been a big fan of PNG for a long time now. In short your files will be bigger with PNG than JPG. Neither format will affect usability/compatibility. JPG files 'throw away' information. PNG files do not throw away information. In most applications when you choose to save a picture as a JPG, somewhere there is a 'options' page that has a sliding scale for (quality), or (how much info to throw away). JPG is clever in that the info it throws away is difficult for the eye to notice. For the deep complicated info see JPG http://en.wikipedia.org/wiki/JPEG and PNG http://en.wikipedia.org/wiki/Png Cheers TAJ Simmons microsoft powerpoint mvp awesome - powerpoint backgrounds, http://www.awesomebackgrounds.com free powerpoint templates, tutorials, hints, tips and more... >I recently learned that the "png" file format exists. Can someone tell me >how > png differs from jpg and why I'd use one vs. the other in PowerPoint > (2003)? > Does it affect file size, usability, or what? Thanks in advance. TAJ: Thanks for the knowledge. Think I'll probably stick with jpg since I'm looking to get my PPT template as small as possible. lizajane90 > LizaJane90 > [quoted text clipped - 34 lines] > > (2003)? > > Does it affect file size, usability, or what? Thanks in advance. Lizajane90 >Think I'll probably stick with jpg since I'm looking to get my PPT template >as small as possible. That's probably a good choice - if you keep the 'slider' to high quality most people cannot tell the difference between a JPG and a PNG cheers TAJ > In short your files will be bigger with PNG than JPG. > Neither format will affect usability/compatibility. I'm not so sure with this compatibility problems. Our PPT mac users heavily use the screen copy procedure included in the mac system (the famous apple-ctrl-4). This used to copy a JPEG image in the clipboard on previous versions of Mac OS X. Since a couple of month (one year?), Apple shifted to PNG as the default format. As a result, a number of PPT presentations made on mac could not display images correctly on PCs. It seems the version of Powerpoint PC might be important. So I would not say that the change to PNG will not affect compatibility. After some problems, we decided to revert the screen copy image format to JPEG (using the excellent and free ToolsX utility). But I agree that for printing purposes, the PNG format is better. Sorry for my approximate English technical terms, as my software is in French. Cheers, > > In short your files will be bigger with PNG than JPG. > > Neither format will affect usability/compatibility. [quoted text clipped - 8 lines] > As a result, a number of PPT presentations made on mac could not > display images correctly on PCs. That doesn't necessarily follow. PNG is one of Windows PPT's native formats. Pretty much any image in Win PPT is PNG, JPG or GIF (or gets converted to one of those on import) > It seems the version of Powerpoint PC > might be important. Really really old versions might have trouble with PNG, but anything since 97 shouldn't. What kind of problem do you see on PCs when your users use this screen capture method? It may be that the Mac never attempted to use QT compression on JPGs (which are heavily compressed already) but does now with PNGs? If so, that would cause trouble for PCs. > So I would not say that the change to PNG will not affect > compatibility. [quoted text clipped - 6 lines] > Sorry for my approximate English technical terms, as my software is in > French. But your English is perfectly clear. No worries. > Cheers, ================================================ Steve Rindsberg, PPT MVP PPT FAQ: www.pptfaq.com PPTools: www.pptools.com ================================================ > I recently learned that the "png" file format exists. Can someone tell me how > png differs from jpg and why I'd use one vs. the other in PowerPoint (2003)? > Does it affect file size, usability, or what? Thanks in advance. One problem with JPEGs is artifacts -- small spurious dots scattered around what would otherwise be a solid color, even (and usually) white. You see them in some logos on corporate web sites. If you look carefully in white areas, you may see lone colored dots. Another commonly found bad example is the screen shot. In summary, JPEGs are good for photos; GIF and PNG for logos and screen shots. you can also use pngs if you have a graphic with a transparent area you want to 'float' over your powerpoint background, such as a logo. >I recently learned that the "png" file format exists. Can someone tell me >how > png differs from jpg and why I'd use one vs. the other in PowerPoint > (2003)? > Does it affect file size, usability, or what? Thanks in advance. |
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