Military Forum for Russian and Global Defence Issues


    Tu-16 airplane (book)

    avatar
    Djabberwocky

    Posts : 7
    Points : 13
    Join date : 2017-05-23

    Tu-16 airplane (book) Empty Tu-16 airplane (book)

    Post  Djabberwocky on Tue Dec 17, 2019 4:16 pm

    Dear colleagues!
    You can download the book:
    "Tu-16 aircraft. Technical description (Book 1: tactical flight data)" (Moscow: Oborongiz, 1956)
    The book is illustrated with drawings and photo illustrations. Volume - 22 pages of a larger format. "-.jpeg" file format.
    Download Link https://yadi.sk/d/m2y2VCNWj1tFsw
    For a full list of books in Russian, you can download our illustrated pdf-catalog from MAKS-2019: https://yadi.sk/i/Jx0Q2Elun2207A
    The book can be downloaded until December 22, 2019 inclusive. Distribution catalog - indefinitely.
    GarryB
    GarryB

    Posts : 23001
    Points : 23543
    Join date : 2010-03-30
    Location : New Zealand

    Tu-16 airplane (book) Empty Re: Tu-16 airplane (book)

    Post  GarryB on Wed Dec 18, 2019 2:51 am

    Thanks for that Djabberwocky.

    Can I suggest, if you know the person scanning the documents, if they don't have colour pictures you will get a smaller file size with quality good enough for OCR if you save them in the GIF format. It is not good at colour images because it is limited in the number of colours it uses, but when the image is just text then extra colours is actually a bad thing because it adds a lot of extra information in the file that is totally wasted because 200 shades of colour of white through to black are not needed when it is black text on white paper...

    GIFs are also good for cartoon like images where there is not a lot of shading and thousands of colours as it makes the files smaller without losing useful detail.
    avatar
    Djabberwocky

    Posts : 7
    Points : 13
    Join date : 2017-05-23

    Tu-16 airplane (book) Empty Re: Tu-16 airplane (book)

    Post  Djabberwocky on Wed Dec 18, 2019 3:22 pm

    Thanks for your technical comment!
    I will be happy to work with everyone who enjoys our work. There is a lot of unique technical material.
    I don’t really worry about file sizes. I hope you enjoyed my work.
    GarryB
    GarryB

    Posts : 23001
    Points : 23543
    Join date : 2010-03-30
    Location : New Zealand

    Tu-16 airplane (book) Empty Re: Tu-16 airplane (book)

    Post  GarryB on Thu Dec 19, 2019 12:47 pm

    File sizes are important for most users... smaller file sizes load quicker and update quicker when you are moving through them in a slide show or media player.

    The only benefit of a large file size is resolution and detail, but if you can achieve a smaller file size while retaining the image quality then it makes sense to do so.

    Just reducing the jpg quality you can also reduce the file size but the image quality gets much worse and would make OCR much less effective.

    OCR means translations into other languages becomes possible converting what is essentially a group of pictures containing information you need to extract manually by viewing the image. It turns it into a text file which can be translated into other languages and searched to find information much more easily.

    It is like the difference between having a book with or without an index... to find specific information you need to manually search through the book to find what you are looking for.

    It is much better to have huge file sizes with very high resolution images than to have too low an image quality that ruins the information there, but you need to find a balance. Generally for text a good resolution is 300dpi to allow OCR, but as I said if it is just black text on a white or yellowing with age paper background you don't need the thousands or millions of colours a jpg can store... unless there are colour images I would save it as a grey scale and gif to make the image file rich in detail if OCR or other processing is needed but such settings would also mean a relatively small file size, so storing them or downloading or uploading them will be easier and quicker respectively... and also you can look through them faster on any computer.

    Very simply if you want to create a library of old books as a resource using OCR would make them much much smaller and fully search-able which greatly increases their value in terms of a library. Imagine a library with no index where you had to look through images of books to find what you want... very inefficient.
    GarryB
    GarryB

    Posts : 23001
    Points : 23543
    Join date : 2010-03-30
    Location : New Zealand

    Tu-16 airplane (book) Empty Re: Tu-16 airplane (book)

    Post  GarryB on Thu Dec 19, 2019 2:25 pm

    Sorry, to be clear I have reread my posts and I almost come across as bullying... I am sorry for that, I appreciate you posting these books and making them available to us.

    Good resolution images like this can be loaded into Yandex and their OCR function can allow translation into other languages to allow this information to be made useful.

    On the internet however, making things available for downloading ties up resources and with large file sizes even more so, but if you can achieve an acceptable level of quality with a much smaller image size that can save a lot in terms of download size and increase download speed as well as reduce the footprint of a library of files on a hard drive.

    Again, My thanks for making this work available, I do appreciate that very much.

    (note at: https://translate.yandex.com/ocr you can upload a page of this Tu-16 book and after a few seconds it will load the image and highlight text it detects in yellow. If you then left click on the yellow blocks it translates them into english... or whatever other language you set... like having your own personal translator though not perfect of course...)
    avatar
    Djabberwocky

    Posts : 7
    Points : 13
    Join date : 2017-05-23

    Tu-16 airplane (book) Empty Re: Tu-16 airplane (book)

    Post  Djabberwocky on Sat Dec 21, 2019 10:39 am

    Thank you again for the detailed technical comment!
    Maybe you could download the book and remake it for other users? Many would be grateful to you, I'm sure!
    GarryB
    GarryB

    Posts : 23001
    Points : 23543
    Join date : 2010-03-30
    Location : New Zealand

    Tu-16 airplane (book) Empty Re: Tu-16 airplane (book)

    Post  GarryB on Sat Dec 21, 2019 11:50 pm

    That is the frustrating thing... I am currently using Linux and it is taking me a while to work out how to get windows products that would do the conversion job well like Irfanview or Format Factory to work under this operating system.

    Even very old versions of photoshop allowed you to save image files where you could change the format type and resolution and image size and it would show the file size so you could take one page and have four versions of it on screen each taking up a quarter of the screen with the original image and then three other available alternatives so you might have the original jpg in the top left and in the top right you might have a lower quality jpg setting, while bottom left you could have gif format and bottom right maybe tiff file format and you could see each image side by side zoomed in on text or images on the same page so you could compare the quality directly with the original. It would also display the file size for each format so if there is a huge reduction in file size but everything is still clear you could base your choice on file size, or if the picture is not good enough you can change the parameters... most jpgs have millions of colours per pixel which means 16 to 24 bits per pixel depending on the image quality.. with a gif you might only need 256 colours... which means 8 bits per pixel would be fine.

    It is something I have been meaning to do... work out more useful tools in Linux that I used to use a lot when I was using Windows or even Workbench. With Irfanview there are batch processing scripts... you could just drag all the pages into the process list and choose convert to gif and then click start.

    I remember doing a project where I was working with documents someone else had scanned where each page was 3-4 megabytes like these ones and it was a real pain in the ass because it was a few years ago and the computer I was using was much slower than this one. It took days to download ten pages on dial up, and I couldn't work with more than three pages open at any one time... jpg is a compression format so when you have it open it takes up orders of magnitude more space in computer memory... I opened one of the pages you posted in the Linux equivalent of Photoshop called GIMP and the file size open was over 100 megabytes and things didn't move fast or smooth. I decided back then to convert them to gif format files to make them easier to use and work with... do you know how many floppy disks you need for a 4 megabyte file and what a pain in the ass a file splitting programme is to split the files to fit them on a 1.4MB floppy...

    Anyway, after converting to gif, the files were less than 300K each and loaded real fast and I could still use optical character recognition software to convert it into editable text that I could then search and edit... it made everything so much easier.

    The person who scanned it didn't know what I was using it for so they scanned at 600dpi to get every single detail, but most of the time legible text is all you need... which means 300dpi is good enough without being too bloated a file for OCR.


    Anyway sorry for going on about this... thank you again for posting the book. Smile

    Sponsored content

    Tu-16 airplane (book) Empty Re: Tu-16 airplane (book)

    Post  Sponsored content


      Current date/time is Sun Jan 19, 2020 2:24 am