Questions tagged [cgimagemaskcreate]
8 questions
15
votes
3 answers
Core Graphics CGImage mask not affecting
What I'm essentially trying to do is have a text label 'cut' a text-shaped hole through the view. I've tried using self.mask = uiLabel but those refused to position the text correctly so I'm approaching this through Core Graphics.
Here's the code…
Downgoat
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3
votes
1 answer
How to remove the transparent area of an UIImageView after masking?
In one of my iOS applications, I am trying to cut a portion of an image using CGImageMask. I have succeeded in masking the image with the following code:
- (UIImage *)maskImage:(UIImage *)referenceImage withMask:(UIImage *)maskImage {
…
Thampuran
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1
vote
0 answers
Masking a progression UIImage
I have a UIImage that I plan on creating a mask for so that when the user continues through the enrollment process they are presented with each number going from non-active, to active, to complete (check mark). I am also creating a "error" sign as…
Swift_Bosak
- 79
- 9
1
vote
2 answers
Replace all white/nearly white pixels in a UIImage with alpha using CGImage?
I have a UIImage with white background. I would like replace the white background/pixels with alpha-transparent pixels. I've looked at other questions on StackOverflow, along with Quartz documentation, but have yet to find a coherent "start-to-end"…
Peter Hajas
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1
vote
0 answers
Turning a freehand drawing in a UIImageView into a mask
I am making an app that let's the user draw over an object/person in a image which I then want to act as a mask in order to blur the background of the image.
I am using the following code to allow the user to draw on an image view that is above the…
user2096136
- 21
- 1
0
votes
2 answers
cgimagemaskcreate and memory leak, how to fix it
i have this code:
Texture2D *cachedTexture;
if(cachedTexture = [cachedTextures objectForKey:aName]) {
return cachedTexture;
}
// We are using imageWithContentsOfFile rather than imageNamed, as imageNamed caches the image in the device.
//…
sefiroths
- 1,555
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0
votes
2 answers
Bitmap context for wide color range
I am trying to create an image mask with kCGColorSpaceDisplayP3 colorspace to support the iPhone 7's wide color range.
I am able to create image mask correctly when using sRGB colorspace on iPhone 6 and earlier devices using iOS 10 and earlier iOS.…
maven25
- 231
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0
votes
0 answers
How to make CGImageMaskCreate work on 3.5-inch devices?
Here is a question for the very experienced iOS developer.
The Core Graphics function CGImageMaskCreate creates a CG image mask from a grayscale image. I am using a JPG exported as grayscale. I double checked: When opening in Photoshop, going to…
iamjustaprogrammer
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