Problem with cover size for converted mobi file using Calibre
 

I haven't used Calibre in a few years but I recently needed to update an ebook which is in the mobi file format. I used Calibre to convert the book and everything looks good however the last time I used the software there were not 4 different Kindle versions. The book looked fine and so did the cover. This time the cover is pretty small when I view the KindleDX and Kindle HDX. On the Kindle HD it's size is okay. I attached a screen shot.

The size of my book cover right now is 600x800 pixels. I am assuming that is the issue. If that is the case please let me know what is the appropriate size. I have been looking all over for an answer with no luck.

Also I noticed the title is being cut off. The is the title in the html which I have on every page of my ebook. Is there a way to get it to wrap, or do I need to make the title shorter? Thanks

Anyone?

The amazon publishing guidelines have recommended cover sizes, just google for them. As for title, yes you will need to make it shorter.

Okay but I have one more question. Do I need to put the cover in the actual epub or can I choose for calibre to remove first image and then just use the cover file in the metadata? I notice if I remove the first image during the conversion from epub to mobi when I open the mobi in kindle previewer it brings me right to the title page without the cover. If I click the left arrow it will bring me back to the cover page which I think is from the metadata. I just can't find anything definitive on this.

The 600x800 cover looks fine when opened in sigila and then when I view on an ipad its perfect. When I put the new size cover, I chose 1525x2500 or something like that (I don't know the actually number right now), and that looks huge when I am viewing it in sigil prior to the conversion in calibre to mobi.

Anybody?