Resize an RGB image

[vikashg]

Hello I am trying to use a pipeline where I feed in RGB images. The images when read using LoadImage() gives an array of size (1024, 2678, 3). As mentioned in discussion #3635, the Resize() function assumes a channel first format. Following that, I tried

transform_list = Compose([LoadImage(image_only=True), AsChannelFirst(), Resize((500, 500))])
x = transform_list('filename.png')
print(x[0].shape)

The output is (500, 500). I fear that I loose the color information in 3 channels. What will be an appropriate method to resample a RGB image.
Thanks

[Nic-Ma]

Hi @vikashg , may I know why you use x[0].shape instead of x.shape?
x still contains 3 channels for RGB.

Thanks.

[vikashg]

Ok because I thought that the transformlist will output a list of images as default. but I might have messed up. While we are on the topic. Suppose I need to train something on a 3 channel image, in monai the data format is (num_batch_size, num_channel, sizex, sizey) ? Is that right ?

[Nic-Ma]

transforms work for single image, DataLoader generates a batch data for network.

Thanks.