This is what I have so far (my UIImageView is in a table cell, no image below it... I'd like the blend mode to handle when I select a row in the table (the uiimageview image should blend into the selected row color) - what I have isn't working (shows white around edges of the image) - I also have alternating background colors in the rows in the table so it's easy to see some of these images with white areas around edges.
UIImage *img = [[UIImage alloc] initWithData:imageData]; CGSize size = img.size; UIGraphicsBeginImageContext(size); [img drawAtPoint:CGPointZero blendMode:kCGBlendModeMultiply alpha:1.0]; UIImage *blendedImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); projectImageView.image = blendedImage; *//doesn't display as multiply* What might I be doing wrong here? On Fri, Jan 22, 2010 at 10:19 AM, Luke the Hiesterman <luket...@apple.com>wrote: > Create a context with UIGraphicsBeginImageContext, apply your blend, and > get the image out of the context with > UIGraphicsGetImageFromCurrentImageContext, and don't forget to end your > context. > > Luke > > On Jan 22, 2010, at 6:59 AM, Eric E. Dolecki wrote: > > Okay, how would I go about doing that? > > On Fri, Jan 22, 2010 at 9:52 AM, Luke the Hiesterman > <luket...@apple.com>wrote: > >> You should perform whatever blending you need to do on the image itself to >> create a new image which you can then just put into a UIImageView like you >> would any other image. This way, you only have to blend once, and then it's >> just image that can be straight drawn rather than performing a blending >> algorithm every time your image has to draw. >> >> Luke >> >> On Jan 22, 2010, at 6:08 AM, Eric E. Dolecki wrote: >> >> > I am loading up a table with contents from an XML file and loading >> images >> > into some cells. Since these images were made for the web some have >> white >> > backgrounds. I would like to somehow set them as "multiply" as one might >> do >> > in Photoshop to make the white "go away". Blendmode kind of thing. >> > >> > Do I need to subclass UIView, set blendmode in it's drawRect, place the >> > UIImageView in there, then apply to a cell... >> > or is there a way I can simply set a blendmode to a UIImageView? >> > >> > Eric >> > _______________________________________________ >> > >> > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) >> > >> > Please do not post admin requests or moderator comments to the list. >> > Contact the moderators at cocoa-dev-admins(at)lists.apple.com >> > >> > Help/Unsubscribe/Update your Subscription: >> > http://lists.apple.com/mailman/options/cocoa-dev/luketheh%40apple.com >> > >> > This email sent to luket...@apple.com >> >> > > > -- > http://ericd.net > Interactive design and development > > > -- http://ericd.net Interactive design and development _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
