magento-test/app/code/Magento/Swatches/etc/view.xml

<?xml version="1.0"?>
<!--
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
-->
<view xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Config/etc/view.xsd">
    <media>
        <images module="Magento_Catalog">
            <image id="swatch_image" type="swatch_image">
                <width>30</width>
                <height>20</height>
            </image>
            <image id="swatch_thumb" type="swatch_thumb">
                <width>110</width>
                <height>90</height>
            </image>
            <image id="swatch_image_base" type="swatch_image">
                <width>30</width>
                <height>20</height>
            </image>
            <image id="swatch_thumb_base" type="swatch_thumb">
                <width>110</width>
                <height>90</height>
            </image>
        </images>
    </media>
</view>