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PNG format is supported in most browsers. The only real issue with PNG is when you use transparency, which can look strange with old browsers (specifically, Internet Explorer 6). See http://en.wikipedia.org/wiki/Comparison_of_web_browsers#Image_format_support for a table of browsers and their image format support.
I do not recommend JPEG / JPG for any application where precision is an issue. JPEGs are smudgy, and resaving a JPEG after editing further degrades it. PNGs, on the other hand, are 'lossless' - meaning they are as high-quality as the source. I also avoid TIFF and BMP, other common image formats. Few browsers display TIFFs, and BMPs have large filesizes / download times.
If the electronic format is a PDF, I also suggest checking your PDF creator's image quality settings. Set to a high DPI (at least 360).
Finally, the above is all for naught if the photographs are taken poorly - though I'm sure this is hardly new to you.
> Date: Mon, 4 Apr 2011 10:20:42 -0400
> Subject: Using photographs in documentation
> From: rahennessey -at- gmail -dot- com
> To: techwr-l -at- lists -dot- techwr-l -dot- com
> Good morning,
> I am starting a contract to write an installation guide using photographs or
> This is a rush project. As I have only used photos in manufacturing
> documents, I'd like some input
> on a valid workflow to use.
> The documents will be viewed in electronic format which leads me to think
> either a jpeg format
> or a png format. I am thinking because I have to resize the images, png
> format might work best
> for image clarity. Is the png format supported in most browsers?
> If anyone can point me to good resources/discussion I'd appreciate it. I did
> check the list
> before posting.
> Any suggestions are greatly appreciated.
> Thank you.
> Bobbi Hennessey
> Roberta Hennessey
> Technical Writer
> (978) 835-4282
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