When I started using steemit I did not know what would be the best size of image to use as a header image for my posts, and the fact that the thumbnail you get in the list of posts on the website does generate based on that image makes it even more important to use one that is the right size.
After a bit of experimenting and trying different things I have settled for a header image that is 800x480 in resolution, this is ensuring that that the post gets a good first image in terms of size and the ratio of width/height ensures that the thumbnail will be fine too.
I see a lot of people that still use various kinds of image sizes not only for the first photo in their post, but for the rest of the post as well. You might try to stick to 800x480 resolution (or at least maintain that ratio), so that an important part of your image does not get cut in the thumbnail.
I've been using 800x480 images for most of my posts, unless it is a screenshot or a photo that does not need to be cropped to that exact size for quite a while with good results. Though after just checking there might have been some changes and now it may seem that a 800x460 image might be a bit better choice in order for the auto generated thumbnail to match what the header image is displaying... still I think I'll probably stick to 800x480 as it still does work quite well.
Like it or not the thumbnail image on the New page plays a lot of role on steemit in grabbing the attention of many of the users and I'm sure that a lot of people even just go by without paying much of attention to posts without images and thus no header image.
I hope that tip helps somebody and might be useful for people that are not sure what size of images to use on steemit.
If you have a question or want to add something, then please leave a comment below.
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