Why my output image file turn out grayscale?

hey im trying to implement an image procecssing algorithm in simulink for xilinx fpga. my question is why my output is grayscale? i dont even implement the algorithm yet. whats wrong with my code?

thanks for the answer:)

[KSSV]

How did you read the image in matlab?

Answer 1

[Bharath Venkataraman]

You have two issues with your model.

1. Change the Output Buffer Size setting for the Buffer block to 512*512*3.
2. Instead of the Covert 1-D to 2-D block, use the reshape block with the setting Output dimensionality set to Customize and the Output Dimensions set to [512,512,3]. Connect the Reshape block to the Video Viewer1 and output workspace block.

I was able to see the color image in both Video viewer1 and Video viewer2.