OTA bitmap

<h2 id="basic-format-description">Basic format description</h2>
<p>The OTA Bitmap format is a monochrome, uncompressed format using one bit per pixel. As the format was designed for cellular phones, there is no standard computer format. It may be stored as a <a href="/facts/Binary_file/ysttM8hh">binary file</a> or as hex (usually without spaces) in a text file. Recognized <a href="/facts/Filename_extension/cJgfAym4">extension</a> is .otb.
</p>
<h2 id="the-data-header">The data header</h2>
<p>Before the image itself there is a header. The header is four bytes wide. A typical example is:
00 48 1C 01. These are:
</p>
  00 The 'Infofield' (always remains as 00).
  48 The width of the bitmap, 72 pixels in this case (48 is <a href="/facts/Hexadecimal/02ohQW22">hex</a> for 72).
  1C The height of the bitmap, 28 pixels in this case (1C is hex for 28).
  01 The number of colours (always 1).

<p>Other possibilities may be: 00 48 0E 01 (for 72x14 bitmaps), 00 48 0D 01 (for 72x13 bitmaps).
</p>
<h2 id="encoding-the-pixels">Encoding the pixels</h2>
<p>After the header the image itself starts.
This example will use the following 72x28 pixel image.
</p>

<p>The first 8 pixels, reading right from the top left hand corner are one white (0) followed by seven blacks (1111111), giving the first <a href="/facts/Byte/BNHUp9Qq">byte</a>, in <a href="/facts/Binary_numeral_system/a6JDSRPs">Binary</a>, as 01111111.
</p><p>Converting from the <a href="/facts/Binary_numeral_system/a6JDSRPs">binary</a> 01111111 to <a href="/facts/Hexadecimal/02ohQW22">hex</a>, results in the first byte that represents the pixels (7F). The next 8 characters are 8 blacks (11111111 or FF) and so on.
</p><p>When all pixels from the top row are encoded, simply move to the next. There are no markers to indicate a new row, that information is contained in the header.
</p><p>In the case of an OTA bitmap that is not a multiple of eight pixels in width, a single byte is used to convey information from two lines (e.g. two pixels from the first row and six from the second.) This is not the case in some other formats, so it is important to exercise care when converting between OTA and formats like <a href="/facts/Wireless_Application_Protocol_Bitmap_Format/Qpeor3BW">WBMP</a>.
</p>
<h2 id="putting-it-together">Putting it together</h2>
<p>Here is the result of the image converted to OTA.
</p>
   00 48 1C 01  //Header
   7F FF EF FF EF FF FB FF FE //First Row
   40 3F E8 38 2F FF FB FF FE //Second Row
   48 3F A8 38 2F 9F FB FF FE //Third Row
   4C FF A9 FF 2F 8F FA DA DA //Fourth Row
   4E FF 29 01 2F 80 FA 52 52
   5E 7F 69 31 2F BF 7B 07 06
   4F FF 69 79 2F BE FB 77 76
   47 FF 69 79 2F BE 7B 07 06
   47 FE EF 7D EF BE 7B FF FE
   47 FC EF 7D E7 BC F1 FF FC
   40 F0 EF 7D E7 7C F1 ED BC
   21 E7 C9 79 27 98 F1 E5 3C
   21 E7 C9 39 27 C8 F1 F0 7C
   16 6F 89 39 23 E6 E0 F7 78
   15 2F 88 82 23 F3 E0 F0 78
   08 3F 04 44 43 D7 E0 FF F8
   04 3E 02 28 81 EF C0 7F F0
   02 3C 01 39 00 FF 80 3F E0
   01 38 00 BA 00 7F 00 1F C0
   00 F0 00 7C 00 3E 00 0F 80
   FF C0 00 38 00 1C 00 07 FF
   55 FF FF FF FF FF FF FF AA
   2A F3 87 87 3F 1E 67 0F 54
   15 F3 93 9F 3E 4E 27 27 A8
   2A F3 87 8F 3E 4E 07 27 54
   55 F3 93 9F 3E 0E 47 27 AA
   FF F3 9B 87 0E 4E 67 0F FF  //Penultimate Row
   00 FF FF FF FF FF FF FF 00  //Last Row

<h2 id="support-in-applications">Support in applications</h2>
<h3>Read/write support</h3>
<ul><li><a href="/facts/ImageMagick/sIC3ycHo">ImageMagick</a><a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a></li>
<li><a href="/facts/XnView/IKB63vzd">XnView</a> (Not XnviewMP use legacy Xnview version) (as of version 1.97, <i>Tools</i> → <i>Options</i> → <i>General</i> → <i>Display all image file types</i> flag must be enabled, otherwise XnView will neither display nor save files of this format)</li></ul>
<p>Note to review: there is no write support for OTA format in XnView 
</p>
<ul><li>Despite the image format calls OTA as the mentioned it above, image files can only be viewable if the file extension is ".otb"  if you have any ota bitmap files, to view them first you could change its extensions to ".otb"</li>
<li>File Viewer for Android This android app also read .otb files. App can be download from Google Play Store<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a></li></ul>
<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Operator_logo/mccSzdPf">Operator logo</a></li></ul>

<ul><li>Nokia Smart Messaging Specification v3.0.0</li></ul>

<h2 id="external-links">External links</h2>
<ul><li><a href="https://web.archive.org/web/20080120155220/http://www.forum.nokia.com/#navi">Forum Nokia</a> – Nokia Developer Website</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>"Introducing Image Formats". ImageMagick Studio LLC. Archived from the original on 21 March 2012. Retrieved 21 March 2012. <a href="https://web.archive.org/web/20120321022307/http://www.imagemagick.org/www/formats.html" target="_blank">https://web.archive.org/web/20120321022307/http://www.imagemagick.org/www/formats.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>"File Viewer for Android – Google Play'de Uygulamalar". <a href="https://play.google.com/store/apps/details?id=com.sharpened.androidfileviewer&hl=tr" target="_blank">https://play.google.com/store/apps/details?id=com.sharpened.androidfileviewer&hl=tr</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
</ol>

OTA bitmap open-in-new

OTA bitmap