the wheather I use JPEG, GIF or PNG they all show some kind of interference pattern in Tk.
When looking at them with the Microsoft Photo Editor they are smooth.
Is there something I can do about it?
Thank you very much!
Have you checked your screen resolution? If you are using something like VNC to view it with, you'd get exactly the interference you've described as VNC defaults to a lower resolution in order to increase
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Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions.
Consider email address RFCs:
Look at HTML5 form input element (with type=email) regex pattern: