Hi Richard, In your OUTPUTFORMAT declaration maybe try setting the DRIVER to *AGG/PNG8* Also IMAGEMODE PC256 was only for GD support that was removed in 7.0. Try IMAGEMODE RGB (or RGBA if you want transparency).
Seth -- web:http://geographika.co.uk twitter: @geographika On Sat, May 15, 2021, at 8:00 PM, Richard Greenwood wrote: > I built from main and tested with ANTIALIAS ON and ANTIALIAS OFF. Assuming > that my mapfile syntax below is correct, there is no difference in size and > the resulting PNG is still approximately 3x larger than the MapServer 6.4 > one. > CLASS > STYLE > COLOR 255 255 208 > ANTIALIAS ON > END > END > Again, thank you for your suggestions. > Rich > > On Sat, May 15, 2021 at 11:21 AM Even Rouault <even.roua...@spatialys.com> > wrote: >> Actually, I just tried to open mapserv64.png with gimp, and export it as a >> non-interlaced or interlaced PNG. And the non-interlaced version is 60 kB vs >> 96 kB for interlaced. So interlacing vs non-interlacing isn't the cause >> here. >> Looking more closely at mapserv64.png vs mapserv76.png , they are visually >> different. I suspect the rendering to be of higher quality in 7.6 due to >> anti-aliasing and perhaps better quantization to 8-bit. You could perhaps >> try to turn off antialiasing in your CLASS.STYLE. This has been re-vived >> very recently for AGG line rendering. It is master only however. >> Le 15/05/2021 à 19:07, Richard Greenwood a écrit : >>> Even, >>> >>> Thank you. I had ignored the difference in the interlacing of the two >>> images because I didn't think it would have affected the size. >>> >>> The maprgbapng.c file no longer exists in MapServer 6.4 or 7.6. There is an >>> "if ( interlaced ..." code block in mapoutput.c that is the same in 6.4 and >>> 7.6. I tried forcing it ON and rebuilding 7.6 but the output image still is >>> not interlaced. Maybe that code is just a left over. Or maybe AGG doesn't >>> support interlacing as https://www.mapserver.org/mapfile/outputformat.html >>> seems to suggest. >>> >>> In any case, thanks again. >>> Rich >>> >>> >>> >>> On Sat, May 15, 2021 at 9:59 AM Even Rouault <even.roua...@spatialys.com> >>> wrote: >>>> Richard, >>>> your 6.4 image is a interlaced PNG, whereas the 7.6 is a non-interlaced >>>> one. >>>> I see in the git history a relevant commit: >>>> >>>> $ git show 9984b39cc8f74d60eb240728df660a172a118aad >>>> commit 9984b39cc8f74d60eb240728df660a172a118aad >>>> Author: Thomas Bonfort <thomas.bonf...@gmail.com> >>>> Date: Sun Oct 5 15:59:44 2008 +0000 >>>> >>>> rgba_png: don't interlace by default >>>> >>>> >>>> git-svn-id: http://svn.osgeo.org/mapserver/trunk@7960 >>>> 7532c77e-422f-0410-93f4-f0b67bdd69e2 >>>> >>>> diff --git a/maprgbapng.c b/maprgbapng.c >>>> index 105d8d61..c3615edd 100644 >>>> --- a/maprgbapng.c >>>> +++ b/maprgbapng.c >>>> @@ -357,10 +357,13 @@ int msSaveImageRGBAQuantized(gdImagePtr img, gdIOCtx >>>> *ctx, outputFormatObj *form >>>> int bot_idx, top_idx; >>>> int remap[256]; >>>> int reqcolors = atoi(msGetOutputFormatOption( format, >>>> "QUANTIZE_COLORS", "256")); >>>> + const char *interlace; >>>> ms_png_info info; >>>> info.width = gdImageSX(img); >>>> info.height = gdImageSY(img); >>>> - if( strcasecmp("ON", msGetOutputFormatOption( format, "INTERLACE", >>>> "ON" )) == 0 ) >>>> + interlace = msGetOutputFormatOption( format, "INTERLACE", "OFF" ); >>>> + if( strcasecmp("ON", interlace) == 0 || strcasecmp("YES", interlace) >>>> == 0 >>>> + || strcasecmp("1", interlace) == 0) >>>> info.interlaced=1; >>>> else >>>> info.interlaced=0; >>>> >>>> But this predates 6.4 release by several years, so this doesn't explain >>>> why you see a different behavior, unless something in 6.4 still turned on >>>> interlacing on in that configuration. >>>> From what I can see in the doc, the interlacing mode was removed in the >>>> 7.0 release when GD went off, so I don't think you can do much. I guess >>>> that could be re-added but would require some coding. >>>> Even >>>> >>>> Le 15/05/2021 à 17:43, Richard Greenwood a écrit : >>>>> I get significantly different image sizes between MapServer 6.4 and 7.6 >>>>> with the same output format definition. I've tried many variations of the >>>>> following. >>>>> >>>>> OUTPUTFORMAT >>>>> NAME "png-test" >>>>> DRIVER "AGG/PNG" # GD driver is same (6.4 only) >>>>> MIMETYPE "image/png; mode=8bit" >>>>> IMAGEMODE PC256 >>>>> FORMATOPTION "QUANTIZE_FORCE=on" >>>>> FORMATOPTION "QUANTIZE_COLORS=256" >>>>> EXTENSION "png" >>>>> # TRANSPARENT on or off makes little difference >>>>> END >>>>> >>>>> MapServer 6.4 <https://greenwoodmap.com/mapserv64.png> is 90kB, MapServer >>>>> 7.6 <https://greenwoodmap.com/mapserv76.png> is 320kB. Any suggestions as >>>>> to how I can get my MapServer 7.6 image sizes down closer to what I'm >>>>> getting in MapServer 6.4? >>>>> >>>>> Thanks, >>>>> Rich >>>>> >>>>> -- >>>>> >>>>> Richard W. Greenwood, PLS >>>>> www.greenwoodmap.com >>>>> >>>>> _______________________________________________ mapserver-users mailing list >>>>> mapserver-users@lists.osgeo.org >>>>> https://lists.osgeo.org/mailman/listinfo/mapserver-users >>>>> >>>> -- >>>> http://www.spatialys.com My software is free, but my time generally not. >>> >>> >>> -- >>> >>> Richard W. Greenwood, PLS >>> www.greenwoodmap.com >> -- >> http://www.spatialys.com My software is free, but my time generally not. > > > -- > Richard W. Greenwood, PLS > www.greenwoodmap.com > _______________________________________________ > mapserver-users mailing list > mapserver-users@lists.osgeo.org <mailto:mapserver-users%40lists.osgeo.org> > https://lists.osgeo.org/mailman/listinfo/mapserver-users >
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