//First line create memory leak
UIImage *ImageAvatar =  [[UIImage alloc] initWithData:[myg.imageData copy]];
Moins1 = ImageAvatar;
//[ImageAvatar release]; if i release-> EXC_BAD_ACCESS

UIImage *Moins1;
...
@property (nonatomic, retain)   UIImage			*Moins1;

UIImage *Moins1;
@property (nonatomic, retain) UIImage *Moins1;

NSData * imageData = [myg.imageData copy];
UIImage * ImageAvatar = [[UIImage alloc] initWithData:imageData];
[imageData release];
[self setMoins1:ImageAvatar];
[ImageAvatar release];

UIImage *ImageAvatar =
    [[UIImage alloc] initWithData:[[myg.imageData copy] autorelease]];
self.Moins1 = ImageAvatar;
[ImageAvatar release];

self.Moins1 = [UIImage imageWithData:[[myg.imageData copy] autorelease]];