What a hell! This shocking message scared me. I picked up my eyes from my table and put them back. then I started a virus check immidatelly. I checked every files on my host, all files on my development computer, and I download Easy Mosaic from severy public download website and all of them are clean. I use severy updated antivirus softwares and all report are clear.
The Easy Mosaic Install package on our official website is 100% clean!

Later I search few website which provide pirate softwares, and I found cracked easymosaic on their website, and they provide a crack patch. I installed the cracked version into a test computer.
Well, the crack patch works! It removed the trial time limit. good job, crackers.

I start running our cracked software to create some photomosaics, humm, it works. I am so glad that they did not destory my render engine. but it is not full functional, it is a trial vresion render still.
But, what the hell is this? The Internet Explorer pops up automatically. without my operation. It carry me to a strange website, lot of adult content and stupid stuffs and ads.

Now I understand, the cracker hooked a trojan to the trial version software, and hacked it to unlocked the time limit.  But the hacked version easymosaic does not contains the full functional render engine as a full version.

The only way to get a clean full version is place an order in our offical site www.ezmosaic.com
Our quality worth the price. you dont need to risk your computer by using a pirate software.

If you have any questions about Easy Mosaic, please mail to support@ezmosaic.com

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

shell tile mosaic-created by easy mosaic

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

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

I get confused at the begining. I am very sure my program already provided enough resolution for most situations. Hummm. I stop nag here, and show you a sample:

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Show Time:

This is a photomosaic I created, at 200PPI resolution.  The size is about 40×32 inch.

I take it to a photofinishing shop and printed the photomosaic, then I placed it over the floor, ready to take some photos for it, there are two harddriver on it, as a size reference.
I use a Fuji Finepix S6500 to take a photo at 2 meter distance.

click for larger view

Now I will get closer and take a new photo.  1.5 meter distance

click for larger view

Now, more closer, and a new photo. at 1 meter distance

click for larger view

More.  at 40cm distance.

click for larger view

More closer, 20 cm distance,  I placed a quater and a dime on the photo.

click for larger view

 The last one. 5cm distance.
 Look, our photomosaic keeps great details at such close distance.
Average person cannot see smaller pixels with out a magnifier. So we are not going more closer.

click for larger view

Showtime is over, Now let me nag.
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I talked with some user, then I found the source of this question.
The fact is,  the user has been told that his printer can printing a high resolution image at 1200DPI.
So he think he may need a 1200DPI photomosaic for the printer.
It is a big confusion.  You dont need a 1200DPI image for a 1200DPI printer.

The photomosaic rendered by computer is a digital image, The image size is calculated by PIXELS. for example, a 1000×1000 pixels image. It stored as ‘010111000101101′ binarys, so  people can not see a digital image, until we use an output device to display it.
For example, your computer monitor is a output device, Your printer is a output device, the lcd viewfinder of your digital camera is a output divice.

We use PPI to define the resolution of output device. PPI = Pixels per Inch. For example, If your output resolution is 200 PPI, the 1000×1000 pixels image will be outputed as a 5×5 inch result.  The common computer monitor’s resolution is 96PPI, so, a 1000×1000 pixels will take about 10×10 inchs on your screen.  The commercial photofinishing devices work at 200 to 300PPIs,  FujiFilm’s Frontier LP7900, work at 300PPI, then we can get a 3.3×3.3 inch printed photo.

DPI only refers to the printer, Every pixel output is made up of different coloured inks (usually 4 or 6 colours, depending on your printer). Because of the small number of colours, the printer needs to be able to mix these inks to make up all the colours of the image. So each pixel of the image is created by a series of tiny dots.

A 1200 dpi printer uses 1200 dots of ink in every inch to make up the colours. If you were printing a 150 PPI image, then every pixel would be made up of 64 smaller ink dots (1200 DPI x 1200 DPI) / (150PPI x 150PPI).

The more ink dots we used to printing a pixel, the better color depths we can reach.
While printing ture colored images, a 1200DPI printer can be thinked as a 150PPI devices.

Summary: You rarely need your image resolution to be higher than 200 PPI for most printers.