File: //var/www/html/wp-content/plugins/webp-express/lib/options/options/conversion-options/jpeg.inc
<?php
/*
jpg
Encoding: Lossy / Auto
Quality for lossy: Auto / specific
Near-Lossless quality (0-100) (default: 60)
png
Encoding: Always lossless / Auto
Quality for lossy (0-100)
Near-Lossless quality (0-100) (default: 70)
Alhpa quality (0-100)
*/
// Quality - jpeg
// --------------------
//$canDetectQuality = false;
?>
<tr id="jpeg_row" class="toggler effect-opacity">
<th scope="row" colspan=1>
Jpeg options
<?php echo helpIcon(
'The "jpeg" settings applies when the image being converted is a jpeg.'
);?>
</th>
<td id="jpeg_td">
<div>
<label>
WebP encoding:
</label>
<select id="jpeg_encoding_select" name="jpeg-encoding">
<?php
webpexpress_selectBoxOptions($config['jpeg-encoding'], [
'lossy' => 'Lossy',
'auto' => 'Auto',
]);
?>
</select>
<?php echo helpIcon(
'<p>The WebP format supports two types of encoding: lossy and lossless.</p>' .
'<p>If you select "Auto", WebP Express will try converting to both encodings ' .
'and select one that resulted in the smallest file.</p>' .
'<p>Note that Gd and Ewww does not support the "Auto" feature. ' .
'Gd can only produce lossy, and will simply do that. ' .
'Ewww can not be configured to use a certain encoding, but automatically chooses lossless encoding for PNGs and lossy for JPEGs.' .
'</p>' .
//'<p>Also note that Remote WebP Express (if the WebP Express you are ' .
//'connecting to are using one of these, and you are using version 0.14+)' .
'<p>You can read more about the option <a target="_blank" href="https://github.com/rosell-dk/webp-convert/blob/master/docs/v2.0/converting/introduction-for-converting.md#auto-selecting-between-losslesslossy-encoding">here</a></p>'
);?>
</div>
<div>
<label>
Quality for lossy:
</label>
<select id="quality_auto_select" name="quality-auto">
<option value="auto_on" <?php echo ($config['quality-auto'] ? 'selected' : ''); ?>>Same as the jpeg</option>
<option value="auto_off" <?php echo (!$config['quality-auto'] ? 'selected' : ''); ?>>Fixed quality</option>
</select>
<?php echo helpIcon(
'<p>If you select the "Same as the jpeg" option, WebP Express will try to determine the quality of ' .
'the jpeg and use that for the webp - unless the quality is higher than the limit entered, in which ' .
'case the limit is used.</p>' .
'<p>Ouality detection requires imagick, imagemagick or gmagick (not neccessarily compiled with webp). ' .
'In case quality detection is not available, the fallback quality is used.</p>' .
(
$canDetectQuality ?
'<p><i>Quality detection is working, btw :)</i></p>' :
'<p><b>Quality detection is not currently available on your system.</b> ' .
((extension_loaded('imagick') && class_exists('\\Imagick')) ?
'You have imagick, but you need a newer version (You need PECL >= 2.2.2). ' : ''
) .
'However, you can still have it by using the <i>Remote WebP Express</i> conversion method (the request for ' .
'using same quality as the jpeg, as well as the <i>limit</i> and <i>fallback</i> settings will be forwarded to the remote)' .
'</p>'
)
);
/*
if ($canDetectQuality) {
echo helpIcon('All converted images will be encoded with this quality');
} else {
echo helpIcon('All converted images will be encoded with this quality. ' .
'For Remote WebP Express and Imagick, you however have the option to use override this, and use ' .
'"auto". With some setup, you can get quality detection working and you will then be able to set ' .
'quality to "auto" generally. For that you either need to get the imagick extension running ' .
'(PECL >= 2.2.2) or exec() rights and either imagick or gmagick installed.'
);
}
*/
?>
<div id="max_quality_div" style="margin-left:10px;display:inline-block" class="toggler effect-visibility">
<label>
Limit:
</label>
<input type="text" size=3 id="max_quality" name="max-quality" value="<?php echo esc_attr($config['max-quality']); ?>" style="text-align:right; padding-left:0px; padding-right:4px; width:34px">
<?php echo helpIcon(
'Quality is expensive byte-wise. For most websites, more than 80 is a waste of bytes. ' .
'This option allows you to limit the quality to whatever is lowest: ' .
'the quality of the jpeg or the limit entered here. Recommended value: Somewhere between 50-85'
);?>
<label style="display:inline-block; margin-left:10px">
Fallback:
</label>
<input type="text" size=3 name="quality-fallback" value="<?php echo esc_attr($config['quality-specific']) ?>" style="text-align:right; padding-left:0px; padding-right:4px; width:34px">
<?php
echo helpIcon(
'Fallback quality in case quality detection is not available or should fail for some reason (which has yet to be seen). ' .
(
$canDetectQuality ?
'You have quality detection working, btw, so this setting will probably never be used' :
'<i>You do not have quality detection working, btw</i> - which means that all conversions will have the fixed quality entered here'
)
);
?>
</div>
<div id="quality_specific_div" style="display:inline-block" class="toggler effect-visibility">
<input type="text" size=3 name="quality-specific" value="<?php echo esc_attr($config['quality-specific']) ?>" style="text-align:right; padding-left:0px; padding-right:4px; width:34px">
<?php
echo helpIcon('Enter number (0 - 100)');
?>
</div>
</div>
<div id="jpeg_quality_lossless_div" class="toggler effect-visibility">
<label>
Quality for lossless:
</label>
<select id="jpeg_enable_near_lossless" name="jpeg-enable-near-lossless">
<?php
webpexpress_selectBoxOptions($config['jpeg-enable-near-lossless'] ? 'on' : 'off', [
'on' => 'Apply preprocessing',
'off' => '100% lossless',
]);
?>
</select>
<?php
echo helpIcon(
'<p>What? Lossless is lossless, right?. Well, that depends on how you look at it. ' .
'The webp conversion library has this nifty option called "near lossless preprocessing". The preproccesing manipulates ' .
'the image before encoding in order to help compressibility.</p>' .
'<p>Note that the near-lossless option only is supported by the <i>Cwebp</i> and <i>Vips</i> conversion methods.</p>' .
'<p>Read more about the feature <a target="_blank" href="https://github.com/rosell-dk/webp-convert/blob/master/docs/v2.0/converting/introduction-for-converting.md#near-lossless">here</a></p>'
);
?>
<div id="jpeg_near_lossless_div" style="display:inline-block; margin-left:10px" class="toggler effect-visibility">
<label>
"Near lossless" quality:
</label>
<input type="text" size=3 name="jpeg-near-lossless" value="<?php echo esc_attr($config['jpeg-near-lossless']) ?>" style="text-align:right; padding-left:0px; padding-right:4px; width:34px">
<?php
echo helpIcon(
'The level of near-lossless image preprocessing (when trying lossless). ' .
'You can think of it as "quality" for lossless. The range is 0 (maximum preprocessing) to 100 (no preprocessing). ' .
'<a href="https://groups.google.com/a/webmproject.org/forum/#!topic/webp-discuss/0GmxDmlexek">Read this</a> to get an informed opinion about appropriate setting.'
);
?>
</div>
</div>
</td>
</tr>