Thank you for all answering. The problem has been solved, it was indeed a resizing problem, choosing " ToLarger" has worked like a charm. Krobill's answer as that and this was the correct answer. I want share the solution with you.

If image doesn't have dimensions that are a power of 2, by default Unity will resize it for you. On our screenshot it's the combo box non power of 2 with the 'to nearest' option selected. This means your texture may have been resized to a lower resolution and is stretched on screen to fit the desired size.

Your options are : - Prevent this resizing, but it's always a good thing to use power of 2 dimensions since it's more hardware friendly - Choose 'To Larger' to allow the resizing but one without loss of data - Resize yourself your texture to a power of 2 dimension which is in fact recommended most of the time.

Thanks again for the quick reply.

Regards.

Looks like compression artifacting. Change the texture format to RGBA32 or something like that instead of automatic compressed or dxt5 or whatever you have it set to.

Also, is your texture actually a power of two? Maybe turn off the NPOT stretching?

How are you drawing the texture?

If you happen to be using a GUI.Label() to draw the texture it adds padding and it distorts images and generally makes them look fuzzy (in my experience).

Try using GUI.DrawTexture() instead and see if that helps.

Have you toyed around with the filter mode of the texture? Bilinear filtering will, by default, tend to slightly smudge the pixels around to attain some slight softness in textures. It's ideal to not filter your UI textures at all though if you want them to be in the exact way you originally drew them.