If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Image Compression
Can someone please explain the options in the Format Picture dialog box,
Picture tab, compress picture button ---- or point me at a reference document to review? Thanks! |
#2
|
|||
|
|||
Image Compression
I don't know of any reference materials, so here goes.
apply to Selected Pictures All pictures in document These options do just what they say -- select "selected pictures" to apply compression to the picture you have selected. Select "all pictures in document" to apply the compression settings to every image in the document. change resolution web/screen (96 dpi) print (200 dpi) no change These options are the actual compression. Choose Web/Screen if you want the image(s) compressed to 96 dots per inch (it's actually PPI, pixels per inch, but it's labeled as DPI probably because more people know what that is). Choose Print if you don't want the picture(s) compressed that much -- it will compress to 200 ppi instead of 96. Select No Change if you don't want the picture(s) to be compressed. Basically follow the settings -- if you're going to just show the file on a monitor or projector and print handouts, choose Web/Screen. If you need to do higher-end printing (which some people use PPT for), then you'll want to choose Print. Here's more explanation of PowerPoint and resolution: Scanning - Bitmap Resolution - DPI http://www.pptfaq.com/FAQ00074.htm As an example, if you've taken high-res images on a digital camera and then inserted them into PPT, they'll generally be very oversized for what you need for a presentation. Generally speaking, your PPT images need to be only 1024 x 768 pixels -- or whatever settings your monitor is set to, because PPT can't show any more than your monitor can. But on newer mega-pixel cameras, you get, well, mega amounts of pixels! So your inserted images will have tons of extra pixels. This causes the file size to be disproportionately big. I'll give you a specific example. I had a client try to send me a file recently. She'd added a bunch of high-res pictures to her 250-slide presentation, and the file size was 500 MB. That's half a gig!! I had her run picture compression, and the file became about 50MB. Now, one of the images on a slide took up about 1/4 of the slide. So when she ran compression, it compressed that image to about 2.5 inches x 2 inches (about 1/4 of the slide) at 96 dpi. When I decided to make the picture fill the slide, it became very pixelated. I needed more pixels. Luckily the client had sent me the original file on CD, so I was able to go back to the large original picture with extra pixels. I inserted that into the presentation, made it full-slide size, then compressed it. So then it compressed to 10 inches x 7.5 inches at 96 dpi and was no longer pixelated. My point is, you want to think about the size of the picture on the slide before you go compressing. If you think you might want the picture to be much bigger, then don't compress it. I think you can choose "apply to selected picture" and then "no change" to prevent that image from being compressed, but now that I think of it, I'm not positive it works that way. I know the RnR Image Optimizer compression utility does work that way, though. http://www.pptools.com/index.html Hopefully someone will be along shortly to clarify about PPT's picture compression. Options Compress pictures Delete cropped areas of pictures Compress pictures is obvious. Choose it if you want to compress pictures -- that is, change the DPI/PPI as described above. Delete cropped areas. When you crop a picture in PPT, those parts of the picture are still there. To see it in action, insert a picture, then crop it. Then drag the cropmark the opposite direction. The cropped information is still there. If you choose this option, then those parts will be deleted. This makes the file size a bit smaller, usually, because unnecessary parts that weren't showing are now actually deleted from the file. -- Echo [MS PPT MVP] http://www.echosvoice.com What's new in PPT 2007? http://www.echosvoice.com/2007.htm Fixing PowerPoint Annoyances http://tinyurl.com/36grcd PowerPoint 2007 Complete Makeover Kit http://tinyurl.com/32a7nx "suejay" wrote in message ... Can someone please explain the options in the Format Picture dialog box, Picture tab, compress picture button ---- or point me at a reference document to review? Thanks! |
#3
|
|||
|
|||
Image Compression
My point is, you want to think about the size of the picture on the slide before you go compressing. If you think you might want the picture to be much bigger, then don't compress it. I think you can choose "apply to selected picture" and then "no change" to prevent that image from being compressed, but now that I think of it, I'm not positive it works that way. In case it occurs to anyone to ask "So why are you in the Compression dialog if you want No Change to the image ..." If the image has been cropped, selecting No Change and "Delete cropped areas of picture" seems to remove the unwanted bits w/o changing the resolution. ----------------------------------------- Steve Rindsberg, PPT MVP PPT FAQ: www.pptfaq.com PPTools: www.pptools.com ================================================ |
Thread Tools | |
Display Modes | |
|
|