I typically set my image resolution for the web at 72 pixels/inch. Does Google look at image resolution as a ranking signal? Should I save my images at higher resolutions or does it not matter? The higher resolution images mean larger k sizes but I was not sure about what is acceptable.
Additional links I found helpful:
http://youtu.be/h2Zaj0CAUoU (the most helpful)
Different Search Engines have different criteria/Algo. For Image search but as far as
Google image searchis concernedI haven’t seen any such evidence that the resolution matters for a general image search, rather markup techniques (proper naming, right
altattribute ) plays a vital role.But the resolution/size of your image will matter when the user filters the image results through sizes
Large,MediumIconetc.There is a lot of info about optimizing images for Google search, Just use Google itself to find a more detailed answer, I found few links below pretty helpful though not specific to Google but can give you fair idea about the whole process, you might want to have a look at these:
Top 7 image optimization tips for SEO and site speed
How To Optimize Images For Search Engines…