Why are image sizes doubled when added to an SKScene

Question

I've recently switched from Cocos2D to Sprite Kit. But I've come across an annoying problem. Any image added to an SKScene is doubled in size. I do exactly the same thing both in Sprite Kit and Cocos2d. Here's Cococs2D version:

CCSprite *sprite=[CCSprite spriteWithFile:@"w64.png"];
sprite.position=CGPointMake(100.0,100.0);
[self addChild:sprite];// self is a CCScene

and here's the Sprite Kit version:

SKSpriteNode *sprite=[SKSpriteNode spriteNodeWithImageNamed:@"w64.png"];
sprite.position=CGPointMake(100.0,100.0);
[self addChild:sprite];// self is an SKScene

In the first case I get the image with its actual size but in the second case the sizes are doubled, both width and height. I don't scale anything anywhere. I have tried all available SKSceneScaleMode options, none of them help

Answer 1

Ahh, the problem was indeed with the naming of the images as @Dobroucudni Tapir said. As I mentioned before, it didn't help at first. But I tried cleaning the project and it worked. Now I wonder why I have to suffix my images in Sprite Kit while I don't have to do so in Cocos2D. What if my application is for retina displays only?