Converting grayscale images to RGB with Tensorflow

[BRN]

Hello!
For my project I need to converting some images from grayscale to RGB using Tesorflow. My code is this:

image_grayscale = tf.io.read_file('image_bw.png')

image_grayscale = tf.image.decode_png(image_grayscale, channels=1)

image_grayscale = tf.convert_to_tensor(image_grayscale[:,:,:3])

image_rgb = image.grayscale_to_rgb(image_grayscale)

tf.io.write_file('image_rgb.png', tf.image.encode_png(image_rgb))

but I receive this error:

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
/tmp/ipykernel_2762/1709057148.py in <module>
      
----> 8 image_rgb = image.grayscale_to_rgb(image_grayscale)

     10 tf.io.write_file('image_rgb.png', tf.image.encode_png(image_rgb))

~/.local/lib/python3.9/site-packages/PIL/Image.py in __getattr__(self, name)
    515             deprecate("Image categories", 10, "is_animated", plural=True)
    516             return self._category
--> 517         raise AttributeError(name)
    518
    519     @property

AttributeError: grayscale_to_rgb

I can't understand what the problem is. Can someone help me?

Thank you

 

[Mark44]

Without seeing more of your code, it appears to me that whatever image is, it doesn't have a grayscale_to_rgb() function/method.

How is image defined?

 

[pbuk]

How is image defined?

I think the answer is probably that it isn't. The clue is that all the other references start with tf.: the OP obviously meant to call tf.image.grayscale_to_rgb.

 

[jedishrfu]

I asked ChatGPT your question:

There is no method grayscale_to_rgb in the Image class from the Python Imaging Library (PIL).

It looks like you are trying to convert a grayscale image to an RGB image, but the method you are using does not exist.

To convert a grayscale image to an RGB image using the PIL library, you can use the convert method of the Image class and pass in the 'RGB' mode as an argument. For example:

from PIL import Image

# Open the grayscale image
image_grayscale = Image.open('image_grayscale.png')

# Convert the image to RGB
image_rgb = image_grayscale.convert('RGB')

# Save the RGB image
image_rgb.save('image_rgb.png')

 

[PeterDonis]

I can't understand what the problem is. Can someone help me?

Given the code snippet you've shown us, line 7 doesn't make sense. You are calling a method on a variable named "image", but that variable has not been referenced anywhere above that line (although it's evidently somewhere in preceding code, since the error you got didn't say "image" was unknown). It would make more sense in line 7 to be calling a method on "image_grayscale".

 

[PeterDonis]

@BRN have you looked at TensorFlow's API documentation?

https://www.tensorflow.org/api_docs

 

[pbuk]

Overcomplicating a little?

I asked ChatGPT your question:

A great example of why any linguistic bot is unsuitable for technical questions: the answer is factually accurate but answers a different question to the one being asked.

The correct answer is trivial and was given in #3: line 7 should be

image_rgb = tf.image.grayscale_to_rgb(image_grayscale)

https://www.tensorflow.org/api_docs/python/tf/image/grayscale_to_rgb

 

[BRN]

Overcomplicating a little?

A great example of why any linguistic bot is unsuitable for technical questions: the answer is factually accurate but answers a different question to the one being asked.

The correct answer is trivial and was given in #3: line 7 should be

image_rgb = tf.image.grayscale_to_rgb(image_grayscale)

https://www.tensorflow.org/api_docs/python/tf/image/grayscale_to_rgb

Oops! what a shame!

What a trivial error I made. I apologize.
I have to stop writing codes overnight. I promise!

Thank you all for your answers!

 

[pbuk]

I have to stop writing codes overnight. I promise!

Nah, it should be when you can do your best work (no interruptions!) You might want to use an IDE that picks up slips like this as you type though - notice how VS Code underlines the missing 'image' object (ignore the squiggle under tensorflow, it is not installed in the environment I am using).