2014/10/15 下午 10:04:37

iphone Programming Glossary: blending

How would I tint an image programatically on the iPhone?

http://stackoverflow.com/questions/1117211/how-would-i-tint-an-image-programatically-on-the-iphone

on the iPhone I would like to tint an image with a color reference. The results should look like the Multiply blending mode in Photoshop where whites would be replaced with tint I will be changing the color value continuously. Follow up I.. want to draw the image first then overlay it with a rectangle filled with the color you want along with the proper blending mode something like this void drawRect CGRect area CGContextRef context UIGraphicsGetCurrentContext CGContextSaveGState..

iPhone development: pointer being freed was not allocated

http://stackoverflow.com/questions/1424210/iphone-development-pointer-being-freed-was-not-allocated

points up CGContextTranslateCTM context 0 sp.image.size.height CGContextScaleCTM context 1.0 1.0 Get the result of the blending of the masked overlay and the base image CGContextDrawImage context rect overlayMasked.CGImage Set the blend mode for the..

composite colors: CALayer and blend mode on iPhone

http://stackoverflow.com/questions/1658751/composite-colors-calayer-and-blend-mode-on-iphone

more resources . So I have a white mask I want to use to filter a background bitmap and I want to try different blending mode. Unfortunately the layers are only adding their colors. Here is my code @implementation WhiteLayerHelper void drawLayer.. WhiteLayerHelper void drawLayer CALayer theLayer inContext CGContextRef myContext draw a white overlay with special blending and alpha values so that the saturation can be animated CGContextSetBlendMode myContext kCGBlendModeSaturation CGContextSetRGBFillColor..

Drawing incrementally in a UIView (iPhone)

http://stackoverflow.com/questions/1798414/drawing-incrementally-in-a-uiview-iphone

context self.bounds maskRef respect alpha mask CGContextSetBlendMode context kCGBlendModeColorBurn set blending mode for Drop drop in myPoints CGContextAddEllipseInRect context CGRectMake drop.point.x drop.size 2 drop.point.y drop.size.. this more efficiently. EDIT Using MrMage's code I did the following which unfortunately is just as slow and the color blending doesn't work. Any other method I could try Method B saving the previous draws in a UIImage and only drawing the new stuff.. CGContextDrawImage context self.bounds maskRef draw the mask CGContextSetBlendMode context kCGBlendModeColorBurn set blending mode cachedImage drawAtPoint CGPointZero draw the cached image EDIT After all I combined one of the methods mention below..

Drawing a PNG Image Into a Graphics Context for Blending Mode Manipulation

http://stackoverflow.com/questions/1936644/drawing-a-png-image-into-a-graphics-context-for-blending-mode-manipulation

and adding them as a subview to the view file via self addSubview someImageView ...but this doesn't allow for blending mode manipulation right Currently the UIImageView vars are being assigned via someImageView UIImageView alloc initWithImage..

How to animate the change of image in an UIImageView?

http://stackoverflow.com/questions/2834573/how-to-animate-the-change-of-image-in-an-uiimageview

into the new image. I thought maybe there's a better solution than just creating a new UIImageView on top of that and blending with animation iphone share improve this question I am not sure if you can animate UIViews with fade effect as it seems..

How to morphing of two images in iphone programming

http://stackoverflow.com/questions/3048732/how-to-morphing-of-two-images-in-iphone-programming

nose the edge of the face and so on these two grid tells the morpher how to translate a point into another one while blending the two images the previous step can be done automatically with specific software or by hand. more points you place better.. use will decide how much will be the final risult similar to the first or the second image you should also apply some blending effect to actually create a believable result always using a parametric function according to the morphing position share..

Choose OpenGL ES 1.1 or OpenGL ES 2.0?

http://stackoverflow.com/questions/4784137/choose-opengl-es-1-1-or-opengl-es-2-0

speak for openGL ES 2.0 Programmable vertex fragmentshader Anything else I heard about performance decrease with alpha blending or so can that be true I assume openGL ES 2.0 code should also run on PC So is openGL ES 2.0 is really more future aware..

How can I crop an Image with mask and combine it with another image (background) on iPhone? (OpenGL ES 1.1 is preferred)

http://stackoverflow.com/questions/5299452/how-can-i-crop-an-image-with-mask-and-combine-it-with-another-image-background

isn't available in OpenGL ES. If you want my drawing code let me know and I'll update my answer. Draw the mask with blending disabled. Enable blending set the GLBlendFunc GL_DST_COLOR GL_ZERO and draw the bleed through texture. My mask is white.. ES. If you want my drawing code let me know and I'll update my answer. Draw the mask with blending disabled. Enable blending set the GLBlendFunc GL_DST_COLOR GL_ZERO and draw the bleed through texture. My mask is white where it should bleed through... mask_texture NSImage imageNamed @ mask texture background_texture NSImage imageNamed @ background texture Enable alpha blending. We'll learn more about this later glEnable GL_BLEND glEnable GL_TEXTURE_2D void draw glClear GL_COLOR_BUFFER_BIT GL_DEPTH_BUFFER_BIT..

Undo drawing in Paint Application

http://stackoverflow.com/questions/6689600/undo-drawing-in-paint-application

this question. There is an application named TouchPainter and its source code is available. It contains drawing color blending Undo Redo Amazing.. Save Open drawings.. Note It may require very deep level knowledge of Objective C and design pattern..

Overlay Color Blend in OpenGL ES / iOS / Cocos2d

http://stackoverflow.com/questions/8771413/overlay-color-blend-in-opengl-es-ios-cocos2d

solution. I started with this image And the basic idea was to draw a rectangle over it in a certain color and apply a blending mode to the image only where the alpha is 1.0 Here is the Code this is part of a Cocos2d project although I think it can.. what I would like with the correct blends iphone ios opengl es cocos2d iphone share improve this question apply a blending mode to the image only where the alpha is 1.0 This sounds like an application for alpha testing. Only that I'd first draw.. and then make the alpha test fail for equal 1.0 or greater than 0.99 to allow for some margin . This doesn't require blending. Edit for updated question Desired results I think you mixed up Multiply and Overlay captions up there. In all those cases..

Record the drawing as a m4v video file - OpenGL

http://stackoverflow.com/questions/9661259/record-the-drawing-as-a-m4v-video-file-opengl

GL_MODELVIEW glDisable GL_DITHER glEnable GL_TEXTURE_2D glEnableClientState GL_VERTEX_ARRAY glEnable GL_BLEND Set a blending function appropriate for premultiplied alpha pixel data glBlendFunc GL_ONE GL_ONE_MINUS_SRC_ALPHA glEnable GL_POINT_SPRITE_OES..