Your best bet would be to use the Save for Web &amp; Devices... option. It's Photoshop's preferred method for exporting for web. That being said, the appearance of color on a website is always at the mercy of the user's screen calibration.  

How to export PNG to be compatible with all browsers
I am new to programming and hence I am stuck on a basic level problem.

Following is code I wrote for comparison. But the result I get does not make sense to me. I would appreciate if someone could tell me what is going wrong. 

There are two arrays: @array1 , @array2 of unequal length. 

I wish to compare both and list down values not present in @array1.

my %temp = map {$_,$_}@array2;
for (@array1){
next if exists $temp{$_};
open (FILE, "&gt;&gt;/filename") or die "$!";
print FILE "$_\n";
close(FILE);
}

