cHiddenImageData vs imageData

Paul Hibbert paulhibbert at
Sat Oct 19 21:40:28 EDT 2013

Hi Bill,

The cHiddenImageData is a Custom Property used to temporarily store the imageData. The "c" prefix gives it away once you get to understand the logic for naming variables & properties etc. See P.165 of the User Guide (if you can find it!).

Quote from the LC webpage "Vision: How do I Convert a Color Image to Grayscale?"

You also have to create the custom property cHiddenImageData for the Image Area. This is used in a subsequent lessons in which it is necessary to have a copy of the image that is being updated.

Hope this helps,


On 2013-10-19, at 5:35 PM, prothero at wrote:

> I'm drawing symbols on an image. The live code tutorial give examples that use 
> the cHiddenImageData of image "image"
> The cHiddenImageData seems to place my changes all along the left side of the image. If I use "the image data", I get reasonable placements for my symbols.
> There is no entry in the documents (6.2.2) for cHiddenImageData. What is it? Why would it be used instead of the plain image data?
> Thanks,
> Bill
> William Prothero
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