Obviously, I wasn’t going to convert 270 images one at a time, so I opened one of the largest images and I began recording an Action in Adobe Photoshop to reduce the dimensions of each image, remove any guides, adjust the levels slightly to increase contrast, and finally, save the file using Save for Web and Devices while a) stripping out any metadata to further reduce file size, and b) using the Optimize to File Size option to allow Photoshop to use only as much compression as required for each individual JPEG to fall under 127 KB. I didn’t want to use more compression than I needed on any given image, because images with less detail will show JPEG artifacts at higher compression settings – I wanted to use just enough to get each image under the target file size of 127 KB. These were greyscale illustrations that were sometimes very simple with a single panel, but more often consisted of six panels with a fair amount of detail and shading, as well as text. The amount of compression required for the JPEG format varies depending on the amount of detail in each image. Many of my images were indeed larger than 127 kilobytes in size – but some were already under 127 KB. It will also reduce the chance of encountering difficulties in conversion due to large file size. Optimizing your images to fit these requirements before uploading to KDP will help decrease the size of your uploaded file. Images that are in other formats supported for upload to KDP (such as BMP or PNG), or that exceed this file size requirement, will be automatically recompressed as JPEG files during the conversion process. Inside your book file, the Kindle book format supports JPEG and GIF images up to 127KB in size. And in any case, after a little more reading on the KDP site I found: I was pretty lucky that the file itself was not too much over 50 megabytes – I figured it wouldn’t be too difficult to get the overall file size under 50 MB as I was planning to run a batch conversion of all the book’s images from the raw format anyway in order to optimize them for Kindle devices. Files over this recommended maximum may experience delays in conversion, or even fail to convert entirely. When uploading your book content to Kindle Direct Publishing (KDP) it is best to keep your file size below 50MB. Here are some guidelines for reducing your file size. All files larger than the 50MB limit will fail to convert. The maximum file size for conversion through Amazon KDP is 50MB. In my first test conversion from EPUB to MOBI, I ended up with an ebook file that was 58.5 MB overall. I’ll talk more about the general process for creating an e-graphic novel in later posts, but for today I want to discuss a specific challenge I faced with this title – image file size restrictions in the Kindle, as well as overall file size restrictions.
#Send to kindle over 50mb code#
Rather than creating a fixed-layout ebook, I found the more efficient route in terms of was to create a regular reflowable ebook in EPUB format, then after filling out the metadata and adding various code tweaks, converting it to Kindle format using Calibre. The author/illustrator reformatted any spreads to work on single pages, and provided me with nearly 300 images, each each of which would be a single page in the ebook. In a recent project, I converted a graphic novel originally destined for print to EPUB and Kindle (MOBI) formats.
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