img shortcode: Extend access to resize_image's quality arg

README.md

@@ -205,7 +205,7 @@ linkedin = "papayatiliqua"
 Included with Papaya is a shortcode for embedding images into your posts:
 
 ```
-img(path, alt, caption, class, extended_width_pct)
+img(path, alt, caption, class, extended_width_pct, quality)
 ```
 
 ### Arguments
@@ -214,6 +214,7 @@ img(path, alt, caption, class, extended_width_pct)
 - `alt`: _(optional)_ The alternate text for the image.
 - `caption`: _(optional)_ A caption for the image. Text/HTML/Tera templates supported.
 - `class`: _(optional)_ Any CSS classes to assign to the image. Multiple classes should be separated with a space (`" "`).
+- `quality`: _(optional)_ JPEG or WebP quality of the image, in percent.  Only used when encoding JPEGs or WebPs; default value is `90`.
 - `extended_width_pct`: _(optional)_ The percentage by which the image's width should be expanded past it's default figure width, up to maximum configured pixel width. 
 
    Range is `0.0-1.0`, or `-1` for document width. 

templates/shortcodes/img.html

@@ -1,11 +1,16 @@
-{# {{ img(path="", alt="", class="", caption="", extended_width_pct=1.3) }} #}
+{# {{ img(path="", alt="", class="", caption="", extended_width_pct=1.3, quality=90) }} #}
 
 {# container_width = (pixel size, px) * (.container's max-width) #}
 {% set container_width = 16 * 42 %}
 
 {# figure_width = container_width - (figure margin_blocks) #}
 {% set figure_width = container_width - (40 * 2) %}
 
+{% set image_quality = 90 %}
+{% if quality %}
+    {% set image_quality = quality %}
+{% endif %}
+
 {% if extended_width_pct %}
     {% if extended_width_pct == -1 %}
         {# adjust extended width to container width #}
@@ -16,9 +21,9 @@
     {% if extended_width > config.extra.images.max_width %}
         {% set extended_width = config.extra.images.max_width %}
     {% endif %}
-    {% set resized_image = resize_image(path=path, width=extended_width, op="fit_width") %}
+    {% set resized_image = resize_image(path=path, width=extended_width, op="fit_width", quality=image_quality) %}
 {% else %}
-    {% set resized_image = resize_image(path=path, width=figure_width, op="fit_width") %}
+    {% set resized_image = resize_image(path=path, width=figure_width, op="fit_width", quality=image_quality) %}
 {% endif %}
 <figure {% if extended_width_pct %}class="extended-figure"{% endif %}>
     <img src="{{ resized_image.url }}" class="{% if class %}{{class}}{% endif %}" {% if alt %}alt="{{alt}}"{% endif %}/>