[PATCH htdocs 1/7] crush images

[Brian Inglis]

On 2022-02-16 23:27, Brian Inglis wrote:
> On 2022-02-14 19:27, Mike Frysinger wrote:
>> Shrink their sizes while maintaining their content by recompressing
>> and stripping unused metadata.
> 
>>   download.jpg   | Bin 1671 -> 1344 bytes
>>   faq.jpg        | Bin 1312 -> 983 bytes
>>   info.jpg       | Bin 1218 -> 886 bytes
>>   logo_big2.png  | Bin 973 -> 844 bytes
>>   mailing.jpg    | Bin 1902 -> 1580 bytes
>>   news.jpg       | Bin 1287 -> 960 bytes
>>   properties.png | Bin 49230 -> 36129 bytes
>>   7 files changed, 0 insertions(+), 0 deletions(-)
> 
> I've had good results usually about 25-50% of PNG replacing some Cygwin 
> images with webp, by tweaking some basic parameters, and comparing 
> sizes, although many of your initial file sizes are small by comparison:
> 
> Cygwin htdocs:
> 
>   639178 png     195942 webp    docs/ug/figures/
>     7458 png/bmp       1112 webp    docs/xlaunch/
> 3548814 png     898900 webp    screenshots/
>   208225 png      30848 webp    screenshots/thumbs/
> 
> 4403675 png/bmp 1126802 webp    total

Converting Newlib-Htdocs images to webp (including newlib.jpg), where 
Recomp are your crushed files, and picking the minimum size of each file 
converted using various webp options detailed and explained in the attached:

Image	 Size	Recomp	Wp-q100	Wp-napp	Wp-naz9	Wp-napd	Wp-ba	  Min
Total	59042	44175	53256	25742	39750	27458	26624	21036

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
[Data in binary units and prefixes, physical quantities in SI.]
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Newlib Htdocs Image Sizes and Webp Options

Image		Type	 Size	Recomp	Wp-q100	Wp-napp	Wp-naz9	Wp-napd	Wp-ba	  Min	Options
download	jpg	 1671	 1344	 2264	  804*	 4792	  884	  854	  804	napp
faq		jpg	 1312	  983	 1418	  474*	 2922	  520	  496	  474	napp
info		jpg	 1218	  886	 1224	  382*	 2682	  436	  404	  382	napp
mailing		jpg	 1902	 1580	 2582	  944*	 5252	 1026	  992	  944	napp
news		jpg	 1287	  960	 1410	  510*	 2778	  562	  540	  510	napp
logo_big2	png	  973	  844	 2462	 1102	  802*	 1248	 1184	  802	naz9
properties	png	49230	36129	39962	20768	16394*	22056	21428	16394	naz9
newlib		jpg	 1449	 1449	 1934	  758	 4128	  726*	  726*	  726	ba/napd
                                                                                
Total			59042	44175	53256	25742	39750	27458	26624	21036	Total

Webp Command and Options:

q100	cwebp -q 100
napp	cwebp -noalpha -preset picture
naz9	cwebp -noalpha -z 9
napd	cwebp -noalpha -preset drawing
ba	cwebp -blend_alpha 0xffffff