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Thanks. Problems solved. But then I decided to change approach – namely want all needed info stored in originating (JPG) meta data rather than using admin menus to set values — and this of course has led to more confusion.
I wrote a simple program to invoke the exif_read_data (based on manual example) on my image file (e.g. phone, radio image in prior post url). The output is:
/opt/wordpress/wp-content/uploads/products-radio.jpg:<br /> Image contains headers<br /> FILE.FileName: products-radio.jpg<br /> FILE.FileDateTime: 1483725849<br /> FILE.FileSize: 12460<br /> FILE.FileType: 2<br /> FILE.MimeType: image/jpeg<br /> FILE.SectionsFound: ANY_TAG, IFD0, THUMBNAIL, EXIF, WINXP<br /> COMPUTED.html: width="141" height="130"<br /> COMPUTED.Height: 130<br /> COMPUTED.Width: 141<br /> COMPUTED.IsColor: 1<br /> COMPUTED.ByteOrderMotorola: 1<br /> COMPUTED.UserComment: bullhorn<br /> COMPUTED.UserCommentEncoding: ASCII<br /> COMPUTED.Thumbnail.FileType: 2<br /> COMPUTED.Thumbnail.MimeType: image/jpeg<br /> IFD0.ImageDescription: 2<br /> IFD0.Software: www.inkscape.org<br /> IFD0.PixelUnit: <br /> IFD0.PixelPerUnitX: 1128<br /> IFD0.PixelPerUnitY: 1128<br /> IFD0.Exif_IFD_Pointer: 2230<br /> IFD0.Title: Radio<br /> IFD0.Keywords: products<br /> IFD0.Subject: radio<br /> IFD0.UndefinedTag:0xEA1C: <br /> THUMBNAIL.Compression: 6<br /> THUMBNAIL.JPEGInterchangeFormat: 4378<br /> THUMBNAIL.JPEGInterchangeFormatLength: 1687<br /> EXIF.UserComment: ASCIIbullhorn<br /> EXIF.UndefinedTag:0xEA1C: <br /> WINXP.Title: ?????<br /> WINXP.Keywords: ????????<br /> WINXP.Subject: ?????<br />From above I want to map :
IFD0.Title: Radio<br /> –> to title query argument in my href string
IFD0.Subject: radio<br /> –> to pageslug query argument in my href string
COMPUTED.UserComment: bullhorn<br /> –> to icon query argument in my href string
IFD0.ImageDescription: 2<br /> –> for image order in the gallery.I have tried various mappings and shortcode arguments (am invoking via do_shortcode within my custom page.php script) and haven’t succeeded in getting example (radio) title,icon, and order mapping correctly. Here is latest incarnation:
[mla_gallery attachment_tag="products" orderby={+exif:ImageDescription+} order=ASC mla_link_href="{+site_url+}/?pageslug={+slug+}&parent=products&title={+exif:Title+}&icon={+image_alt+}" columns=5 mla_margin=0.25%]
with the following mapping: