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<div dir="ltr"><div dir="ltr"><div>Hi</div><div><br></div><div>It seems highly unlikely that a printer would accept http-level compression, but fail to advertise it for IPP playload.</div><div>These are very resource-constrained systems.</div><div>And how would you detect support?</div><div><br></div><div>The rasters already have a rudimentary RLE compression that is pretty decent (~10:1) for text and graphics (but not photos).</div><div>With today's network speeds (or even those of 10+ years ago where many printers seem to be stuck) you are already easily surpassing the physical output of the printer.</div><div>Do you really need to go any faster?</div><div><br></div><div>The recommendation is to apply compression when supported.</div><div>Some printers do seem to perform better when receiving raster that is gzipped or deflated as well - many don't seem to care.</div><div>Hopefully printers not supporting compression have a large enough buffer to not get starved.</div><div><br></div><div>How large is large - and do you have any specific problems you are trying to solve?</div><div><br></div></div><div>Br,</div><div>Anton</div><div><br></div><div><br></div><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">Den tors 26 feb. 2026 kl 10:41 skrev Holger Gräfe via ipp <<a href="mailto:ipp@pwg.org">ipp@pwg.org</a>>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="font-family:"verdana";font-size:12px;color:rgb(0,0,0)"><span style="background-color:rgb(255,255,255)">Hi Piotr,</span></div>
<div style="font-family:"verdana";font-size:12px;color:rgb(0,0,0)"><span style="background-color:rgb(255,255,255)"> </span></div>
<div style="font-family:"verdana";font-size:12px;color:rgb(0,0,0)"><span style="background-color:rgb(255,255,255)">you may try whether compression on HTTP level via header field "Content-Encoding" is accepted by the device. There are various compression methods defined, e. g. "gzip". However, I'm not sure whether any of them is effective for arbitrary raster image data.</span></div>
<div style="font-family:"verdana";font-size:12px;color:rgb(0,0,0)"><span style="background-color:rgb(255,255,255)">You can find more details here: <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Encoding" target="_blank">https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Encoding</a></span></div>
<div style="font-family:"verdana";font-size:12px;color:rgb(0,0,0)"><span style="background-color:rgb(255,255,255)"> </span></div>
<div style="font-family:"verdana";font-size:12px;color:rgb(0,0,0)">Best regards,</div>
<div style="font-family:"verdana";font-size:12px;color:rgb(0,0,0)">Holger</div>
<div style="font-family:"verdana";font-size:12px;color:rgb(0,0,0)"> </div>
<div id="m_4571212071976011944sub-body-container" style="margin:10px 5px 5px 10px;padding:10px 0px 10px 10px;border-left:2px solid rgb(195,217,229)">
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<div><b>Gesendet: </b>Donnerstag, 26. Februar 2026 um 04:40</div>
<div><b>Von: </b>"Piotr Pawliczek via ipp" <<a href="mailto:ipp@pwg.org" target="_blank">ipp@pwg.org</a>></div>
<div><b>An: </b>"PWG IPP Workgroup" <<a href="mailto:ipp@pwg.org" target="_blank">ipp@pwg.org</a>></div>
<div><b>CC: </b>"Piotr Pawliczek" <<a href="mailto:pawliczek@google.com" target="_blank">pawliczek@google.com</a>></div>
<div><b>Betreff: </b>[IPP] Raster compression</div>
</div>
<div><br>
<div>Hello Everyone,</div>
<div> </div>
<div>I am looking for guidance on the best approach for handling larger rasters. Specifically, what is the current recommended method for raster compression?</div>
<div> </div>
<div>There is a "compression-supported" IPP attribute that allows the client to apply compression to the IPP payload. However, for many printers this attribute contains only "none".</div>
<div> </div>
<div>I cannot find any reference to HTTP-level compression. Is it mentioned in any IPP document? </div>
<div> </div>
<div>Or is there any other way to deal with large rasters?</div>
<div> </div>
<div>I would appreciate any information.</div>
<div> </div>
<div>Best regards,</div>
<div>Piotr</div>
</div>
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