In my animation I need to show an image which is transparent and very few
visible in the beginning, and gradually becomes less transparent brighter. I've
tried with the 'filter' and 'transmit' keywords, but I haven't the result I
expect; with filter 1 the image is too much visible, and I want it to appear
gradually.

I know that the .png images can have the information about transparency , that
is I can decide how many transparent can be a determinate color, but when I use
this image as image_map texture, Pov-Ray tells me that I can't do it, because
the image isn't a mapped image. The .gif image is too low resolution color.

For my animation I thought to use the same image with different brightness and
transparency, but for the reasons above described, I can't do.

Has someone suggest me how can I do?

Thanks

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