[css-color-4][editorial] Attempt to silence some nagging emails

Author: svgeesus

css-color-4/Overview.bs

@@ -1860,7 +1860,7 @@ The ''<color>/currentcolor'' keyword</h3>
 			&lt;/style>
 		</pre>
 
-		<p><img src="images/text-emphasis.png" alt="rendered emphasized text with the word 'really' in red with red emphasis dots"/></p>
+		<p><img src="images/text-emphasis.png" width="495" height="119" alt="rendered emphasized text with the word 'really' in red with red emphasis dots"/></p>
 
 		In the above example, the emphasis marks are black over the text "Some" and "emphasized text",
 		but red over the text "really".
@@ -2421,7 +2421,7 @@ HWB Colors: ''hwb()'' function</h2>
 	HWB colors resolve to sRGB.
 
 	<figure>
-		<img src="images/color-picker.png">
+		<img src="images/color-picker.png" width="545" height="309" alt="">
 		<figcaption>
 			This is a screenshot of Chrome's color picker,
 			shown when a user activates an <code class='lang-markup'>&lt;input type="color"></code>.
@@ -2948,7 +2948,7 @@ Device-independent Colors: CIE Lab and LCH, OKLab and OKLCH</h2>
 	but not identical.
 
 	<figure id="CIELCH-blue-hueshift">
-		<img src="images/CIELCH-blue-slice.png" width="541" height="411"
+		<img src="images/CIELCH-blue-slice.png" width="2434" height="1848"
 			alt="diagram showing purpling in CIE LCH">
 		<figcaption>A constant CIE LCH hue slice,
 			showing the sRGB gamut around primary blue.
@@ -2957,7 +2957,7 @@ Device-independent Colors: CIE Lab and LCH, OKLab and OKLCH</h2>
 	</figure>
 
 	<figure id="OKLCH-blue-no-hueshift">
-		<img src="images/OKLCH-blue-slice.png" width="552" height="405"
+		<img src="images/OKLCH-blue-slice.png" width="2485" height="1824"
 			alt="diagram showing hue constancy in OKLCH">
 		<figcaption>A constant OKLCH hue slice,
 			showing the sRGB gamut around primary blue.