Is It Possible to Convert Signed PDF to Jpeg?

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Is it possible to convert Signed PDF to JPEG?

JPEG compression is fairly complex in detail, but easy enough to understand in principle. The raw image is first converted to a different colour model, which separates the colour of a pixel from its brightness, and encodes the colour in a more compact form. This is because the eye is less sensitive to small variations in colour than it is to variations in brightness. Then the heart of JPEG compression is that it divides the image up into 8 x 8 ‘chunks’. The chunks are then transformed into the frequency domain, and the coefficients of the transformed elements then represent the frequency information about that square of the image in terms of decreasing importance. The idea is that small sharp details become high frequencies, whereas the general colouring and brightness of the square is lower frequency information. The resulting transformation can be understood in terms of a sum of wavelets from this base table. Since the table is known, the transformed coefficients are simply matched to the nearest entry in the table. This alters them very slightly, but the idea is that you won’t notice. Also, you can prioritise low frequencies over high ones, setting those higher ones to 0 to ignore them, trading space for detail (one of the effects of the “quality” setting). The sequence of numbers representing the table entries are then easily compressed again (losslessly) by Huffman coding. To reproduce the image, you just reverse the process - look up the matching table entries, combine them for the coefficients you have (and ignoring zeroes) transform back to the spatial domain, then use that to ‘paint’ the pixels of that particular 8x8 square. Of course the result is only an approximation to the original, which is why JPEG is a lossy process.

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However, given that all you can do is approximate, if you can find an image that actually does contain information (e.g. an image of some sort in order to test compression) it is very easy to find what you need, and then find the appropriate algorithm to save it. This is an image of a real person. What you get if you run an image search (without knowing the correct keyword) is that JPEG compression produces, from the actual image of a person, a lot of random noise! There are, however, two ways to recover what the original image would have looked like: This image of a person that was used to test JPEG in 2008 is here. For comparison, here's a JPEG from the original. This is the same type of search that was done on 2008, which shows the image on the left, and the result on.