Resizing Graphics in RoboHelp

Subject: Resizing Graphics in RoboHelp
From: Alexander Von_obert <avobert -at- TWH -dot- MSN -dot- SUB -dot- ORG>
Date: Wed, 28 Aug 1996 20:57:00 +0100

Hello Tammy,

* Antwort auf eine Nachricht von Tammy Sudol an All am 28.08.96

TS> From: Tammy Sudol <tammy -at- ZEUS -dot- ATS -dot- QC -dot- CA>

TS> I'm wondering if anyone is having success resizing graphics in
TS> RoboHelp. We're trying to resize screen captures and find that
TS> they become distorted.

This is a general problem and not especially related to Robohelp:

- Screen captures often contain structures one or two pixels wide.
- If you do conventional resizing the program has to do some kind
of guess which of the zwo colors to use when combining two pixels -
simple resize has no alternative to that.
- You cannot see this problem in photos or other half-tone pictures
because you have much less contrast from one pixel to the next.

I quite successfully used the following work-around:

- Soften the screenshot, perhaps use a higher color resolution
- Resize the softened picture
- Sharpen the resized picture, reduce color count if needed

This delivers surprisingly good results if you do perhaps 20% reduction. The
principle of this conversion is something like this:

- By softening you distribute the information a bit.
- During resize the program does some kind of majority decision
for every single pixel.
- The sharpening works quite well because "synthetic" pictures
like screen shots contain very little "noise".

Greetings from Germany,

Alexander von Obert, Urbanstr. 2, 90480 Nuernberg, Germany
Free-lance Technical Writer (electronics, software)
Voice +49-911-403903, Fax +49-911-403904, BBS +49-911-403905 (FIDO 2:2490/1719)

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