<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Gib,<div class=""><br class=""></div><div class="">Currently the TIFFIO does not support streamed reading. Being able to just read a page is a straight forward first step. In fact when I refactored it I made sure it was clear how this could be done in the future [1].</div><div class=""><br class=""></div><div class="">The correct way to do it would be to upgrade TIFFImageIO with this feature. This would involve changing the parent class to StreamingImageIOBase, then overloading methods to disable streamed writing, and overloading the method ( GenerateStreamableReadRegionFromRequestedRegion ) to enable stream read such that the RequestedRegion is expanded to the whole slice, and verifying all the TIFF fields are valid for this operations.</div><div class=""><br class=""></div><div class="">The tricky part would be to adapt existing tests, and test the new functionality.</div><div class=""><br class=""></div><div class="">After that, the streaming would happen seamlessly with the ITK pipeline, giving there are stream compatible filters and all the features are configured correctly.</div><div class=""><br class=""></div><div class="">Alternatively, there are utilities to split the pages of the TIFF in to separate files.</div><div class=""><br class=""></div><div class="">HTH,</div><div class="">Brad</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Feb 2, 2016, at 12:25 AM, Gib Bogle <<a href="mailto:g.bogle@auckland.ac.nz" class="">g.bogle@auckland.ac.nz</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div style="font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; direction: ltr; font-family: Tahoma; font-size: 10pt;" class="">We want to work with a 3D TIFF that is much too big to fit in memory. It would be sufficient to be able to specify a 2D frame and read that. How can this be done?<br class=""><br class="">Thanks<br class="">Gib<br class=""></div><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">_____________________________________</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; 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