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save an image between 0 and 1

Hi,

I have a problem to save an image with pixel value between 0 and 1. When i save the pixel value in a txt file to check, i have the right value (0.023, 0.15 .....). But when i save this image to an image format, i can't get the see those values. I use imageJ to visualize the image and i test jpeg, png tif and bmp image formats.

What did i have miss?