GD script for web/server creation of images

Douglas Rhiner

What would be really cool is if we had the ability to have a web-based set of krpano Tools / scripts.

Upload an image, leverage the scripting, and out comes the 6 faces and preview.

Zephyr

you could use php exec function? http://php.net/manual/en/function.exec.php
that droplets of krpano support command line

ahoeben

I experimented with using imagemagick to convert from spherical to cubic, but found that the performance was severely lacking in comparison to the krpano tools. Here's an example, extracting the top face from an equirectangular:

Code

convert equirectangular.jpg ( +clone -set option:distort:viewport %%[fx:w/PI]x%%[fx:w/PI]+%%[fx:(w-w/PI)/2]+%%[fx:(h-w/PI)/2] -distort SRT 0 ) +swap -interpolate bicubic -fx "xx=i/w-.5;yy=j/h-.5;ofs=(xx<0)?.5:1.5;pan=(yy==0)?ofs*pi:atan((xx)/(yy))+2*pi;pan=mod((yy>0)?pan+pi:pan,2*pi);tlt=(xx==0&&yy==0)?0:mod(-atan(.5/hypot(xx,yy))+pi/2,pi);v.p{ pan*v.h/pi, tlt*v.h/pi}" out.png

GD script for web/server creation of images

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