Error in saving grayscale or binarized images

[Swapna Patil]

Hello,

My task is to convert RGB scale images to binarized images.

For this, I am converting my input images to HIB bundle and then in the Mapper, I am converting every image to binary format. 

After this conversion, I have object of FloatImage class with single channel. 

Now, while I am trying to save this single channel image on HDFS using JpegEncoder, PngEncoder or PpmEncoder, I am getting the exception that only RGB scale image can be saved using these encoders. 

Is there any way or workaround to save the images with single channel?

Thank you.