iphone - bad quality image in iOS in GLKit -

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i added sprite scene tutorials : http://www.raywenderlich.com/9743/how-to-create-a-simple-2d-iphone-game-with-opengl-es-2-0-and-glkit-part-1

but have bad quality of images files. how fix problems ??

enter image description here

this caused xcode 'compression' of png files, transforms them use premultiplied alpha.

you try replace line :

glblendfunc(gl_src_alpha, gl_one_minus_src_alpha);

which suppose have, mentioned following tutorial, following :

glblendfunc(gl_one, gl_one_minus_src_alpha);

which allow composite premultiplied alpha image on background image.

for more information premultiplied alpha concept, here.

if want xcode stop messing png files, can ask stop : how can skip compressing 1 png?


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