I want to draw a image for example on black canvas, but the the result is always white, here is my code
-(UIImage*) renderImage
{
UIGraphicsBeginImageContext(CGSizeMake(300, 300));
[[UIColor blackColor] setFill];
UIImage*resultImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return resultImage;
}
for the future i will draw an image inside the canvas, but right now i just want a black filled canvas. why this code is not working
You need to be using CGContextSetFillColorWithColor() to fill the current context with a color. Try this sample code, you give it a color and a size and it will return you a UIImage meeting your criteria.
- (UIImage *)renderImageWithColor:(UIColor *)color inSize:(CGSize)size
{
CGRect rect = CGRectMake(0.0f, 0.0f, size.width, size.height);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
Related
I want to do the following:
As you can see one image (selected) does not have a grey fade and the other (nonselected item) does not.
I have tried multiple solutions. Including coloring the images with a grey color
- (UIImage *)colorizeImage:(UIImage *)image withColor:(UIColor *)color {
UIGraphicsBeginImageContext(image.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGRect area = CGRectMake(0, 0, image.size.width, image.size.height);
CGContextScaleCTM(context, 1, -1);
CGContextTranslateCTM(context, 0, -area.size.height);
CGContextSaveGState(context);
CGContextClipToMask(context, area, image.CGImage);
[color set];
CGContextFillRect(context, area);
CGContextRestoreGState(context);
CGContextSetBlendMode(context, kCGBlendModeMultiply);
CGContextDrawImage(context, area, image.CGImage);
UIImage *colorizedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return colorizedImage;
}
However with this approach I run into an issue where if the bg of an image has a transparency the white below it shine through and it looks strange:
How can I detect the transparency and change the transparency to white? Or is there a better solution for doing this?
image = [self imageWithImage:image scaledToSize:CGSizeMake((self.collectionViewContainer.frame.size.width/3),90)];
UIImage *unSelected = [self colorizeImage:image withColor:[[UIColor grayColor] colorWithAlphaComponent:.9]];
UIImageView *imgView = [[UIImageView alloc] initWithImage:unSelected highlightedImage:image];
Since you simply want to apply a gray tint to an image, try it this way:
- (UIImage *)colorizeImage:(UIImage *)image withColor:(UIColor *)color {
UIGraphicsBeginImageContext(image.size, NO, image.scale);
CGContextRef context = UIGraphicsGetCurrentContext();
CGRect area = CGRectMake(0, 0, image.size.width, image.size.height);
[image drawInRect:area];
[color set];
CGContextFillRect(context, area);
UIImage *colorizedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return colorizedImage;
}
This draws the image and then draws the color over the image. Assuming the color is partially transparent, the entire new image will be colored.
As you had it originally, you were only coloring the non-transparent parts due to the image clipping.
This update also applies the proper scale to the new image to match the original image.
I'm currently coloring an existing image using a mask. For example, I have a white image with a black border and a circular mask (like the first two images). Then, I can create a third image with a color (i.e. green) which has green on the center of the original image (because the mask is present there).
The code I'm using is this (suggestions welcomed):
-(UIImage *)paintWithMask:(UIImage *)mask color:(UIColor *)color andSize:(CGSize)size{
UIImage *image = self;
UIImage *rotatedMask = [self rotateImage:mask]; //For some reason this is needed.
UIGraphicsBeginImageContextWithOptions(size, NO, image.scale);
CGRect rect = CGRectMake(0.0f, 0.0f, size.width, size.height);
[image drawInRect:rect];
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetBlendMode(context, kCGBlendModeSourceIn);
CGContextSetFillColorWithColor(context, color.CGColor);
CGContextClipToMask(context, rect, [rotatedMask CGImage]);
CGContextFillRect(context, rect);
UIImage *coloredImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return coloredImage;
}
What I need to do now is paint the green circle using only the mask (without the black border obviously), like this:
Any ideas? Thanks a lot!!
There is a much easier way of doing this without CoreGraphics. Simply do the following:
-(UIImageView *)imageViewWithMask:(UIImage *)mask color:(UIColor *)color andSize:(CGSize)size{
UIImage *tempImage = mask;
tempImage = [tempImage imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
UIGraphicsBeginImageContextWithOptions(size, NO,0);
[tempImage drawInRect: CGRectMake(0,0,size.width,size.height)];
tempImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView *iv = [[UIImageView alloc] initWithImage: tempImage];
iv.tintColor = color;
return iv;
}
Is there way to create a UIImage or a UIImageView from a UIView with background color. My purpose is to get this color in the image. If it is possible, how can I do it?
+ (UIImage *)imageWithColor:(UIColor *)color andRect:(CGRect)rect {
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
I'm trying to change the color of an image at runtime. I've seen a couple answers on SO, but they all change the background color and not the foreground, which is what I am trying to do. I've based my code on another SO thread.
Here's the code I have:
#implementation UIImage (Coloring)
-(UIImage*) imageWithColorOverlay:(UIColor*)color
{
//create context
UIGraphicsBeginImageContextWithOptions(self.size, NO, self.scale);
CGContextRef context = UIGraphicsGetCurrentContext();
// drawingcode
//bg
CGRect rect = CGRectMake(0.0, 0.0, self.size.width, self.size.height);
[self drawInRect:rect];
//fg
CGContextSetBlendMode(context, kCGBlendModeMultiply);
CGContextSetFillColorWithColor(context, color.CGColor);
CGContextFillRect(context, rect);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//end
return image;
}
#end
This are the results thus far:
From left to right:
No blending, just the normal asset. The gray bg is from the UIView behind the imageviews, the bg of the image is transparent.
Multiply with kCGBlendModeMultiply
Color burn with kCGBlendModeColorBurn
Is there an CGBlendMode that'll achieve replacing the foreground color? Also, is it possible to replace both the foreground color(white) and the shadow(black)?
After messing around with the different blend options, this code did the trick. The only caveat is that the red tint is shown in the shadow, its not technically correct but its close enuf
#implementation UIImage (Coloring)
-(UIImage*) imageWithColorOverlay:(UIColor*)color
{
//create context
UIGraphicsBeginImageContextWithOptions(self.size, NO, self.scale);
CGContextRef context = UIGraphicsGetCurrentContext();
//drawingcode
//bg
CGRect rect = CGRectMake(0.0, 0.0, self.size.width, self.size.height);
[self drawInRect:rect];
//fg
CGContextSetBlendMode(context, kCGBlendModeMultiply);
CGContextSetFillColorWithColor(context, color.CGColor);
CGContextFillRect(context, rect);
//mask
[self drawInRect:rect blendMode:kCGBlendModeDestinationIn alpha:1.0];
//end
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
I want to crop a part of an uiimageview that on my view controller. I'm creating a rectangle on top of it:
UIGraphicsBeginImageContext(self.view.bounds.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextMoveToPoint(context, newPoint1.x, newPoint1.y);
CGContextAddLineToPoint(context, newPoint1.x, newPoint2.y);
CGContextAddLineToPoint(context, newPoint2.x, newPoint2.y);
CGContextAddLineToPoint(context, newPoint2.x, newPoint1.y);
CGContextAddLineToPoint(context, newPoint1.x, newPoint1.y);
CGContextClosePath(context);
UIColor *blue = [UIColor colorWithRed: (0.0/255.0 ) green: (0.0/255.0) blue: (255.0/255.0) alpha:0.4];
CGContextSetFillColorWithColor(context, blue.CGColor);
CGContextDrawPath(context, kCGPathFillStroke);
I can't figure out how to crop it right. I'm able to retrieve a capture of the screen : entirely blank with my rectangle on it:
UIImage *cropImage = UIGraphicsGetImageFromCurrentImageContext();
rectImage = cropImage;
UIGraphicsEndImageContext();
UIImageCrop *rectImageView = [[UIImageCrop alloc]initWithImage:rectImage];
[self.view addSubview:rectImageView];
So I'm aware that there is something I've missed about it, any help?
- (UIImage *)captureScreenInRect:(CGRect)captureFrame
{
CALayer *layer;
layer = self.view.layer;
UIGraphicsBeginImageContext(self.view.frame.size);
CGContextClipToRect (UIGraphicsGetCurrentContext(),captureFrame);
[layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *screenImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return screenImage;
}
this is just for reference change this code according to your requirement
hope this will help you
You can get cropped image using :
- (UIImage*) getCroppedImage {
CGRect rect = PASS_YOUR_RECT;
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
// translated rectangle for drawing sub image
CGRect drawRect = CGRectMake(-rect.origin.x, -rect.origin.y, your_image.size.width, your_image.size.height);
// clip to the bounds of the image context
// not strictly necessary as it will get clipped anyway?
CGContextClipToRect(context, CGRectMake(0, 0, rect.size.width, rect.size.height));
// draw image
[your_image drawInRect:drawRect];
// grab image
UIImage* croppedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return croppedImage;
}
Hope it helps you.