Image from color issue

Question

i am using the method below:

+ (UIImage *)imageWithColor:(UIColor *)color {
    CGRect rect = CGRectMake(0, 0, 1, 1);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();

    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;
}

from the link . My issue is that the image returned has not the same color in parameter.

Can you explain a bit more "the image returned has not the same color in parameter"? — Miknash, Jan 29 '15 at 14:01
http://stackoverflow.com/questions/14292212/changing-the-color-of-image-in-iphone-sdkf — lakshmen, Jan 29 '15 at 14:02
for example the input color is [UIColor colorWithRed:219./255. green:94./255. blue:8./255. alpha:1.] the returned image has the code R:208 G:73 B:12 — Tekaya Marouene, Jan 29 '15 at 14:04
i checked this with the colorimeter application in mac os, and the difference is noticeable without. — Tekaya Marouene, Jan 29 '15 at 14:56

Tekaya Marouene · Accepted Answer · 2015-01-30T08:48:22.417

I resolved my issue by replacing CGContextSetFillColorWithColor(context, [color CGColor]); with [color setFill]; the new method will be like the code below:

+ (UIImage *)imageFromColor:(UIColor *)color {
    CGRect rect = CGRectMake(0, 0, 1, 1);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [color setFill];
    CGContextFillRect(context, rect);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

Image from color issue

1 Answers1