将uint8数组转换为图像

Question

I am trying to convert a uint8 array of a 48x48 image to its corresponding 48x48 image file (jpg/jpeg/gif). I tried converting the array contents to first binary and then wrote ('wb' mode) it to a file, but that did not work out.

Is there a way I can accomplish this?

Answer 1

If you are producing the image in TensorFlow (as I'm inferring from your tag), you can use the tf.image.encode_jpeg() or tf.image.encode_png() ops to encode a uint8 tensor as an image:

uint8_data = ...
image_data = tf.image.encode_png(uint8_data)

The result of either op is a tf.string tensor that you can evaluate and write out to a file.

Answer 2

I was able to the same very easily using Octave. Here i have tried to generate a random matrix of 48x48 and then i saved the image as jpg format.

img = rand(48,48);
imwrite(img, "test.jpg")

You can save any type of image with this approach.

If you can give some more details about what you want to achieve. Do u need to do it just once or u need it as part of program.

Hope that helped.