Re: MI jpg in MapInfo 4.5 and 5.0

[Warren Vick, Europa Technologies Ltd.]

Hello Jeff,

> I made a .bmp file from a map in MI 4.5.2. In
> Photoshop 4.0.1 (Tryout Version) it shows it
> at 72 pixels/inch resolution, however, in MS
> Photo Editor 3.0 it shows it at 96
> pixels/inch.  Which is correct and why is
> there a difference?  And related to Manu's
> question, what will the resolution be in MI
> 5.0?

To the best of my knowledge, current and recent versions of MapInfo Pro always save 
map 
windows at a resolution of 96dpi - often regarded as a "screen resolution". However, 
for file 
formats which store the notion of resolution (like TIFF), MI Pro doesn't seem to set 
them correctly. 
For formats which do not support resolution settings, your paint software will choose 
a default, and 
this can be different from package to package. The important thing to remember is that 
in printing 
terminology, *resolution* relates to dot density and *size* relates to the height and 
width of the 
image. For most printing (desktop or creating films) the resolution is normally 
changed anyway. 
300dpi is what I set all my map artwork to before sending to a bureau for film 
creation. One of the 
reasons I like the TIFF format is that it stores size and resolution internally. If 
you have any image 
at 600x600 and the resolution is set to 300dpi, you know for sure that when you bring 
it into 
PageMaker (or whatever) it will be exactly 2 inches square.

So, my advice is to ignore what MapInfo seems to set. Get your size right (inches x 
96) and set the 
resolution after - if your image file format supports it.

Regards,
Warren Vick
Europa Technologies Ltd, U.K.
http://www.europa-tech.com
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