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Formula to determine brightness of RGB color
...olor was used. Each color is represented by 2x2 pixels, colors are sorted from darkest to lightest (left to right, top to bottom).
1st picture - Luminance (relative)
0.2126 * R + 0.7152 * G + 0.0722 * B
2nd picture - http://www.w3.org/TR/AERT#color-contrast
0.299 * R + 0.587 * G + 0.114 * B
...
Why do Lua arrays(tables) start at 1 instead of 0?
...
Lua is descended from Sol, a language designed for petroleum engineers with no formal training in computer programming. People not trained in computing think it is damned weird to start counting at zero. By adopting 1-based array and string...
Git fast forward VS no fast forward merge
... of commits as a single unit, and merge them as a single unit. It is clear from your history when you do feature branch merging with --no-ff.
If you do not care about such thing - you could probably get away with FF whenever it is possible. Thus you will have more svn-like feeling of workflow.
For...
How to deny access to a file in .htaccess
.../directives in the htaccess of subdirectories get applied superceding ones from the parent).
So you can have:
<Files "log.txt">
Order Allow,Deny
Deny from all
</Files>
For Apache 2.4+, you'd use:
<Files "log.txt">
Require all denied
</Files>
In an htaccess fi...
Read input from console in Ruby?
...found in ARGV and only asks to console if not ARGV found. To force to read from console even if ARGV is not empty use STDIN.gets
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How to create the branch from specific commit in different branch
...added bb.txt) is for example not in the history of 07aeec98. If you branch from 07aeec98, you won't get the changes introduced by 8480e8ae.
In other words: if you merge branch A and branch B into branch C, then create a new branch on a commit of A, you won't get the changes introduced in B.
Same h...
Error-Handling in Swift-Language
...ay decided to propagate the error, if your are calling a throwing function from a function that is itself marked with throws keyword:
func fulfill(quest: Quest) throws {
let dragon = try summonDefaultDragon()
quest.ride(dragon)
}
Alternatively, you can call throwing function using try?:
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Should I use the Reply-To header when sending emails as a service to others?
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You may want to consider placing the customer's name in the From header and your address in the Sender header:
From: Company A <joe.bloggs@a.com>
Sender: notifications@b.com
Most mailers will render this as "From notifications@b.com on behalf of Company A", which is accurate....
What are the differences between json and simplejson Python modules?
...have seen many projects using simplejson module instead of json module from the Standard Library. Also, there are many different simplejson modules. Why would use these alternatives, instead of the one in the Standard Library?
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Retrieve list of tasks in a queue in Celery
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You should look here:
Celery Guide - Inspecting Workers
Basically this:
from celery.app.control import Inspect
# Inspect all nodes.
i = Inspect()
# Show the items that have an ETA or are scheduled for later processing
i.scheduled()
# Show tasks that are currently active.
i.active()
# Show tas...