[muglo] Re: Editing and converting Images (Was: PowerPoint

I think this explains a lot.  BMP is a format invented by and for
Windows OS, and so is the software.  I am convinced that it is not
the JPG file itself that is larger, it  is what PPT does with them
that produces this bizarre consequence.  I still maintain that
JPGs are inherently more compressed than BMPs.

Lee

On 2005 Jan 27, at 12:04, Eric Dunbar wrote:

>> There is a slight hitch in PowerPoint and that is that (the Windows
>> version at least) sometimes compresses BMP files. JPEGs come in as
>> compressed images and PowerPoint seems not to be able to handle them
>> effectively -- if you manipulate them they baloon in size. The few
>> times I used BMPs I managed to retain the high quality of uncompressed
>> images but with "smaller" .ppt files (I wonder if it runs BMPs through
>> a GIF-style compression).
>
> Of course, my BMP images (maps) were conducive to effective lossless
> compression since there were long lines of pixels with the same
> colour. The JPEG images (same resolution, 75% quality) resulted in PPT
> files at least three of four times as big.

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