Tile Mosaic is a traditional mosaic art form.

A main image is generated by many small tiny tiles with many colors.

shell tile mosaic-created by easy mosaic

What is a photomosaic?

A photo mosaic is a picture (usually a photograph) that has been divided into (usually equal sized) multiply sections, each of which is replaced with another photograph of appropriate color. When viewed at low magnifications, the individual pixels appear as the main image, while close examination reveals that the image is in fact made up of many hundreds or thousands of smaller images.

photo mosaic sample

Some report said, while then load an image file into easy mosaic, the get a bad quality like this:

It should be loaded like this:

What happend? let’s checked the source picture file:
I opened them in photoshop and found the problem.

These files are saved as JPG file format.
Jpg format have multiply defines and color mode, we cann’t support some special formats.

If your jpg file is saved as RGB mode, everything should be ok, however, If you save them as CMYK format, the error happens.

How to correct the error? 
simply open the picture file and convert the color mode to RGB mode, then save it as a new file.

change color mode with photoshop