Hi all,
First of all, the basics--I am using PDFCreator v1.7.2 on Windows 8.1 64-bit. Now to the story. I was noticing some weirdness regarding file sizes when printing out some Powerpoint slides into PDF format, and that made me do some systematic testing. The results indicate some unexpected behavior--that PDFCreator seems to respect the bitmap downsampling dpi setting for a range of values, but that relationship breaks down at a certain dpi (and apparently any higher dpi value).
More specifics--I have a 1024x645 pixel color bitmap in Powerpoint, and it is set to print out about ~6.9" wide in a form. Let's round that to 7" just to keep numbers simple. So when I change the PDFCreator dpi setting to 50 dpi, I am expecting the resulting bitmap to be downsampled to ~350 pixels wide (i.e. 7" x 50 dpi). And indeed, that occurs--in the outputted PDF, the bitmap is ~350 pixels wide. So I set it to 60 dpi, do the same thing, and expect the resulting bitmap to be about 420 pixels wide (i.e. 7" x 60 dpi). Woo-hoo, it ends up that way. I continue forward so on and so forth, and all the way up to the 98 dpi setting, everything is great. But when I get to 99 dpi and greater, PDFCreator seems to lose its brains, and no longer respects the dpi setting value. It just spits out the full resolution bitmap, but at 1023x645 pixels in size (note that the width is one pixel shorter than the original 1024 pixel wide bitmap).
Here are the actual numbers that I gathered while progressively incrementing the dpi setting from 50 dpi up to 130 dpi. When I recognized the problem zone was between 90-100 dpi, I methodically changed the dpi setting by increments of 1.
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So anyway, that's the story of what I am seeing--PDFCreator seems to downsample appropriately from 50 dpi all the way up to 98 dpi, but once it hits 99 dpi or higher, the program seems to lose track, and just spits out the fill resolution bitmap. Has anybody noted a similar problem?
Many thanks in advance for your help and comments!
verbage
First of all, the basics--I am using PDFCreator v1.7.2 on Windows 8.1 64-bit. Now to the story. I was noticing some weirdness regarding file sizes when printing out some Powerpoint slides into PDF format, and that made me do some systematic testing. The results indicate some unexpected behavior--that PDFCreator seems to respect the bitmap downsampling dpi setting for a range of values, but that relationship breaks down at a certain dpi (and apparently any higher dpi value).
More specifics--I have a 1024x645 pixel color bitmap in Powerpoint, and it is set to print out about ~6.9" wide in a form. Let's round that to 7" just to keep numbers simple. So when I change the PDFCreator dpi setting to 50 dpi, I am expecting the resulting bitmap to be downsampled to ~350 pixels wide (i.e. 7" x 50 dpi). And indeed, that occurs--in the outputted PDF, the bitmap is ~350 pixels wide. So I set it to 60 dpi, do the same thing, and expect the resulting bitmap to be about 420 pixels wide (i.e. 7" x 60 dpi). Woo-hoo, it ends up that way. I continue forward so on and so forth, and all the way up to the 98 dpi setting, everything is great. But when I get to 99 dpi and greater, PDFCreator seems to lose its brains, and no longer respects the dpi setting value. It just spits out the full resolution bitmap, but at 1023x645 pixels in size (note that the width is one pixel shorter than the original 1024 pixel wide bitmap).
Here are the actual numbers that I gathered while progressively incrementing the dpi setting from 50 dpi up to 130 dpi. When I recognized the problem zone was between 90-100 dpi, I methodically changed the dpi setting by increments of 1.
So anyway, that's the story of what I am seeing--PDFCreator seems to downsample appropriately from 50 dpi all the way up to 98 dpi, but once it hits 99 dpi or higher, the program seems to lose track, and just spits out the fill resolution bitmap. Has anybody noted a similar problem?
Many thanks in advance for your help and comments!
verbage