While I am enjoying the microdots-spy approach to tag an image with secret
render host information, am I missing something or you could just check
your render logs?   Or... you don't have logs? =P


On Tue, Jan 29, 2013 at 10:50 AM, chris <[email protected]> wrote:

> or extending on that idea...
> since a single black pixel could be noticable in the middle of bright
> colored pixels, you could duplicate the pixel color next to it (or even
> average the pixels around it), and add an offset with the hostname value.
> this would probably be invisible even by the most critical eyes :)
>
> example if the pixel on the bottom left [0,0] is to hold the machine ID
> data:
> - average pixels [0,1], [1,1] and [1,0] to calculate the [0,0] color value
> - add tiny offset color value representing the machine ID to that pixel
> [0,0]
>
> obviously you'd want a second script which automatically calculates the
> machine ID from the 4 pixels on the bottom left.
>
> there's probably an easier way that i'm not aware of though ;)
> ++ chris
>
>
>
>
> On 1/29/13 at 7:27 PM, [email protected] (chris) wrote:
>
>  hmm, or if you can spare a single pixel somewhere, you could just burn in
>> the hostname as color (or alpha) value...
>> like in the bottom right corner, each render machine gets a slightly
>> different shade of black (ie render1 is 0.00001, render2 is 0.00002 etc)
>>
>> then if you have corrupt renders you could check the pixel value and see
>> where it came from.
>>
>> ++ chris
>>
>>
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