resize - Perl - Image::Magick create specific size image "canvas" while maintaining aspect ratio of original image? -

-

i need create images within 480w x 360h pixel "canvas".

i did create images remote url, no problem stackoverflow.

however, desire maintain aspect ratio of image but, have end result 480x360.. therefore, "canvas" or border crop technique needs used (from have read) but, cannot seem going.

here have:

#!/usr/bin/perl use image::resize; use image::magick; use strict;  $new = 'path/to/image/image.jpg'; $somewords = 'some words'; $imageurl='http://myimageurl.com/image.jpg';  $p = new image::magick; $p->read("$imageurl");   ($origw, $origh) = $p->get('width', 'height'); #### correct size images processed here annotation ########   if (($origw == 480) && ($origh == 360)){   system("convert $imageurl  -fill '#ffffff' -font candice -pointsize 12 -undercolor '#00000080' -gravity southeast -annotate +1+1 '$somewords' $new");   } #### process images of incorrect original size stuck #######   if (($origw != 480) && ($origh != 360)){ system("convert $imageurl $new");    system("convert $imageurl -resize 480x360\! -fill '#ffffff' -font candice -pointsize 14 -undercolor '#00000080' -gravity southwest -annotate +1+1 '$somewords' $new");   }

what need this:

a "canvas" size of 480 x 360.

reduce original image url correct aspect ratio @ either 480w or 360h , place in middle of 480x360 canvas.

i read somewhere, offered no examples, resize original image while maintaining aspect ratio correct height or width whichever allows image largest then, divide other param (h or w) 2 , make add border based on that, crop size. confused "he + double hockey sticks" out of me.

i lost on trying figure out. unsure if question here clear , worthy of asking stackoverflow.

seems resizing while maintaining aspect ratio while creating fixed output image difficult! hours of searching have not helped me.

i praise 1 offers verbose solution. thanks.

isn't bit silly use image::magick module, , use external convert command? can of within perl script using image::magick.

anyway, if read fine manual, you'll find imagemagick resize highest dimensions within 480x360 without changing aspect ratio using 480x360. works both on command-line convert , within image::magick. when add !, you're telling resize 480x360, disregarding aspect ratio.

this should started without using external commands:

... $p->resize(geometry=>'480x360'); $p = $p->montage(geometry=>'480x360', background=>'black', fill=>'white',                  stroke=>'white', pointsize=>12, title=>$somewords); $p->write($new); ...

Comments

Post a Comment

Popular posts from this blog

java - SNMP4J General Variable Binding Error -

-
i trying use snmp4j snmp bulkget. when ever use snmp4j make call returned responseevent error says "general variable binding error" , data returned equal null. to debug: print out, console, exact oid , version number using in snmp4j. use printed out data snmpwalk on command line. valid results. know sending snmp4j correct pdu correct oid, version number, max repititions, etc. i have used snmp4j , code wrote succesffuly monitor other devices years. don't know different time. leaving me stumped. why "general variable binding error?" causes error? ideas debug? can reproduced? if so, first action should using wireshark or microsoft network monitor capture network packets. my guess agent gives generr response, not surprising, http://www.ietf.org/rfc/rfc1157.txt
Read more

windows - Python Service Installation - "Could not find PythonClass entry" -

-
i working on building python service. inducing error, not sure inducing it. ps c:\...> python .\file.py debug debugging service myservice - press ctrl+c stop. error 0xc00000f4 - not find service's pythonclass entry in registry error 1814 - specified resource name cannot found in image file. error 0xc0000080 - not locate module name in python class string (ie, no '.') this error coming pythonservicemessages.mc in pythonwin32. it turns out error result caused exception being thrown , python script dying off.
Read more

Determine if a XmlNode is empty or null in C#? -

-
the following code takes xmlnode data type , populates dataset object xmlnode content. write dataset's content file. public void populatedataset(xmlnode node) { xmlnodereader reader = new xmlnodereader(node); dataset ds = new dataset(); ds.readxml(reader); system.guid guid = system.guid.newguid(); string name = string.format("{0}{1}_{2}.xml", utility.xmloutputpath, utility.xmloutputfilename, guid.tostring()); //need write "node empty" file if xmlnode object empty of null ds.writexml(name, xmlwritemode.ignoreschema); } the problem encountered 1 scenario not write content file. how determine if xmlnode object null or empty? you can check if node parameter null or has innertext or innerxml properties null or empty, when enter method before creating xmlnodereader .
Read more