Mmm. So, the guidelines are that thumbnails should be at least 280px wide and 150px high where possible, because only then will it be shown on Twitter as a full accompanying image - as well as simply showing more to casual viewers.
However, if an existing thumbnail is too small, it should be regenerated from the source image - resizing down is OK, within reason, either in the browser or an image editor, but not up. And the aspect ratio of width vs. height should normally be kept constant, because otherwise it results in deformation.
I've been away from my main computer for a bit and not around with editors to chat about such things, so sorry about that.
Mmm. So, the guidelines are that thumbnails should be at least 280px wide and 150px high where possible, because only then will it be shown on Twitter as a full accompanying image - as well as simply showing more to casual viewers.
However, if an existing thumbnail is too small, it should be regenerated from the source image - resizing down is OK, within reason, either in the browser or an image editor, but not up. And the aspect ratio of width vs. height should normally be kept constant, because otherwise it results in deformation.
I've been away from my main computer for a bit and not around with editors to chat about such things, so sorry about that.