Why does my header image appear blurry on Mobile.

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  Ritu Ahuja: Hi everyone. I have a question regarding the header image of my blog. I have recently changed the header image in blogger. I have noticed that it is blurry when I access my blog through mobile. How to correct it and why it appears blurry on phone view. Please help. 
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  Tony McCreath: It would really help if we could see the website. Posting of its address is not accepted here but you can post it with the dots changed if you are happy to share it.
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  Dave Elliott: I find PNGb images resize better than anything else. 
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  Ritu Ahuja: +Tony McCreath my blog's address is http://scrumptiousyummyrecipe.blogspot.in I will appreciate any help. Thanks. :)
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  Ritu Ahuja: +Dave Elliott Is it because I have resized the picture?
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  Tony McCreath: Looks like the image auto resizes to fit the device. So on smaller devices it will be blurry.
  
  I'm not familiar enough with Blogger but it may let you provide an alternate smaller image for mobile devices.
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  Ritu Ahuja: +Tony McCreath it is not giving any option for mobile device
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  Tony McCreath: I'm no blogger expert. My test blogger uses a template that includes a mobile version.Not sure how editable it is.