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This is my original wallpaper:


After setting it as Lock Screen wallpaper, its quality got reduced and this is how it looks:


Even when set as homescreen, the image quality is reduced.


How to improve the quality of the lock screen/home screen wallpaper?

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Nice pic -- and you are right, the original looks far better. – Izzy Aug 27 '12 at 10:49
That simply appears to be the "effect" of the lockscreen (dimming and blurring the background?). Have you tried a lock screen app replacement such as WidgetLocker? – Bryan Denny Aug 27 '12 at 13:50
@BryanDenny no its not the effect. Check the edit for the homescreen wallpaper. Its quality also is reduced. – emaillenin Aug 28 '12 at 6:57

I have found the solution. The original image size was huge (about 2600 pixels wide). So I used Photoshop and transformed this image to 960 x 480. Now the image looks the same way when set as lock screen or home screen wallpaper like below:


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