RE: Lossy, smaller JPG files

Subject: RE: Lossy, smaller JPG files
From: "Margaret Cekis" <Margaret -dot- Cekis -at- comcast -dot- net>
To: "'Dan Goldstein'" <DGoldstein -at- riveraintech -dot- com>, <techwr-l -at- lists -dot- techwr-l -dot- com>
Date: Thu, 15 Mar 2012 09:34:01 -0400

Dan Goldstein asked whether saving JPG files (a lossy format) received from
someone else (without changes) in Paint Shop Pro, degrades the image
quality, even if he can't detect any loss of quality.
----------------------------
Dan:
I think that the answer is "not necessarily". Paint Shop Pro and other
modern high-quality graphics programs have much more sophisticated
compression and down-sizing algorithms than earlier programs (or even
earlier versions of the packages we are using now). They can compress JPGs
and other common graphics format files with less loss than earlier
compression methods.
Digital cameras and other sources of digital images have had such an
enormous jump in resolution that they exceed the capability of most common
display devices. If you try to display the multi-megapixel image captured by
a modern high-end digital camera on a laptop, or even on a high-resolution
wide-screen monitor, you'll be able to see only a small portion of the
image. These cameras now save images both in this super-megapixel "raw"
format, and in JPGs that "normal" PCs and monitors can handle. Unless you
have a billboard-size screen, downsizing JPG images to the resolution your
screen or application can handle will not degrade the image enough for your
eye to detect it.
Of course, if you still might want to display it on the digital billboard in
Times Square, you should save the original uncompressed file on an offline
drive or a DVD.
Margaret Cekis, Johns Creek GA



^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Create and publish documentation through multiple channels with Doc-To-Help. Choose your authoring formats and get any output you may need.

Try Doc-To-Help, now with MS SharePoint integration, free for 30-days.

http://bit.ly/doc-to-help

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

You are currently subscribed to TECHWR-L as archive -at- web -dot- techwr-l -dot- com -dot-

To unsubscribe send a blank email to
techwr-l-leave -at- lists -dot- techwr-l -dot- com


Send administrative questions to admin -at- techwr-l -dot- com -dot- Visit
http://www.techwhirl.com/email-discussion-groups/ for more resources and info.

Looking for articles on Technical Communications? Head over to our online magazine at http://techwhirl.com

Looking for the archived Techwr-l email discussions? Search our public email archives @ http://techwr-l.com/archives


Follow-Ups:

References:
Lossy, smaller JPG files: From: Dan Goldstein

Previous by Author: RE: Word 2010 cross-reference issue continued
Next by Author: RE: Auto-suggestion tool
Previous by Thread: Re: Lossy, smaller JPG files
Next by Thread: Re: Lossy, smaller JPG files


What this post helpful? Share it with friends and colleagues:

Sponsored Ads


Sponsored Ads