![]() ![]() Alternatively, most operating systems come bundled with a native zip program to use. Depending on the device you’re using to send the files from, you can use a range of popular programs including WinZip for Windows, iZip for Mac computers or AndroZip for Android. To send files wirelessly that exceed 50MB, you need to zip them first to compress the file size down below 50MB. How to Overcome the 50MB “Send to Kindle” File Size Limitĭo you find yourself frustrated by the 50MB limit imposed by Amazon when trying to send large documents to your Kindle wirelessly? If you use it for reading eBooks and files then you may find yourself victim to this limit more often than you’d like, but there is a way around it that doesn’t involve plugging into your computer and transferring via USB cable (not always practical on the move and defeats the purpose of a wireless e-reader!) (Both the files are of 40 KB size.) I am assuming that your Kindle can read neither of the files. The minus-textlayer.pdf is that page minus the text layer. Please check for the text-layer issue too. So, most likely, Kindle is refusing to do this work. The dimensions of the composed image, however, are 2201x3063, so RGB (3 bytes per sample) would take 19 MB! This is the size of the file you will get when you join the three together in the intended manner. In the attached page 2 of the Devises et Emblemes file, the three images together take 42 KB. IA’s PDF files are produced by 'LuraDocument PDF v2.28'. The critical stuff is (i) identifying the foreground and background properly, (ii) filling colours in areas which will not be read so that the image can be compressed best by the compression method of choice ('JPXDecode' for the RGB images in IA files). And similarly, the foreground image will fill the nearby colours in the place in which it will not be read. The point is that the background image will fill surrounding colour in the place where the (foreground) objects are - those parts will not be used anyway - and thus will have a more or less uniform colour or gradient. Second, the background and the foreground images are not limited to one colour - they can be full-fledged RGB images too. So a little, if insignificant, loss in quality is creeping in the IA "compression". First, the background image is saved at a lower resolution, and the reader is asked to interpolate. But that has now 1 bit samples, and not the 27 bytes we earlier had. Also, our most critical data is in the mask - that image has to be the sharpest. At an extreme, you can always imagine the brown and the yellow images taking just a few bytes each: 3 bytes for recording the colour, and a few bytes more for recording the dimensions of the image. This helps as the three can be compressed much better. ![]() '0' in the mask image means the reader is to compose the final image by using the corresponding pixel of the foreground image '1' means that the reader is to use the corresponding pixel of the background image. It is the reader’s work to join them together. In the IA method the image is decomposed into 3 parts: a brown 1000x1000 image, a yellow 1000x1000 image, and a BW 1000x1000 mask, and each of them is compressed and saved separately in the PDF. If such a 1000x1000 sample image is saved in RGB (3 bytes per sample), it would before compression take 3,000,000 bytes. To see why this is useful, imagine brown text on yellow page. The foreground and background are in RGB, the mask is BW (1 bit per sample). So the pdf really contains not 116, but 348 images. Every image that we see in this is made up from 3 images: a background, a foreground and a mask. ![]()
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