Re: [Gimp-user] Move tool locks; what's triggering it?

[Ofnuts <ofnuts gmx com>]

On 06/14/17 00:40, Steve Kinney wrote:
> The word "humongous" comes to mind.  Some things I would suggest is
> cropping layers that do not fill the entire image, so they do not eat up
> any more memory than necessary; avoid converting text layers to image
> layers where and as possible; and maybe most important, delete your undo
> history early and often - it uses a lot of memory.
>
> Another thing to consider is the distance from which the poster will be
> viewed.  The further away from the viewer the less DPI resolution is
> needed.  300 DPI is standard for materials that will be hand held, but
> 200 might be acceptable for a poster that will hang on a wall.  Some
> experiments might be in order.

The relationship between the distance of view and the DPI is  the 
angular resolution of the human eye (about one arc minute). For a 
constant field of view and perceived sharpness, distance and DPI are in 
inverse proportion. In other words the size in pixels is constant. In 
Photography the rule to compute the depth of field considers that the 
eye doesn't see details smaller that 1/1800th of the diagonal (which 
means that 1.5MPix picture wouk dbe good enough). Even doubling that you 
still get a rather small 6Mpix (which, coincidentally, was the 
definition of the sensors when professionals started using digital 
cameras).