<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div>On 06/05/2009, at 1:52 PM, David Nugent wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><span class="Apple-style-span" style="color: rgb(0, 0, 0); ">Once I completed upgrading to mapserver 5.4, I decided I'd give the new AGG renderer a try.</span></div><div>~</div><div><span class="Apple-style-span" style="color: rgb(0, 0, 0); ">However, as a by-product of changing renderer, the metatiles produced by mapserver differ slightly in colour. Some agree exactly to the RBG colours I am providing, others are rendered with slight variations, and when viewed on the web it becomes fairly obvious where the meta tile borders are.</span></div></div></blockquote></div><div><br></div><div><br></div><div>This is to follow up on my own question to which I received no response either on the list or otherwise in case anyone else runs into the same or a similar problem.</div><div><br></div><div>I finally found the problem in that the php mapscript had a bug, and that "AGG_Q" (AGG with quantize enabled) was being selected regardless that I was trying to tell it to do it differently. Once I correctly set it to AGG without quantize, the colour variation between tiles disappeared and all is well.</div><div><br></div><div>One interesting aspect of this is that the average file size did not increase significantly when dropping quantize although in general the tiles rendered using AGG are around 40-50% larger than PNG8.</div><div><br></div>Regards,<br><div apple-content-edited="true"> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: 'Lucida Grande'; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div apple-content-edited="true"><div><div><div><div><div><div><div><div><div><div><div><div><div><div apple-content-edited="true"><div><div><div><div><div><div><div><div><div><div><div apple-content-edited="true"><div><div><div><div><div><div><div><div>--</div><div>David Nugent (<a href="mailto:davidn@datalinktech.com.au">davidn@datalinktech.com.au</a>)</div><div>Software Engineer</div><div>datalink technologies pty ltd</div><div>Mobile GPS/GPRS business process solutions</div><div><a href="http://www.datalinktech.com.au/">http://www.datalinktech.com.au/</a></div><div><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></span><br class="Apple-interchange-newline"> </div><br></body></html>