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Code Issues Releases Wiki Activity

Document peculiarities of JPEG quality parameter

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Jeremy Ruston 2024-12-10 12:47:40 +00:00
parent fd21908896
commit 4eed4cbaa5
1 changed files with 15 additions and 3 deletions
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18
plugins/tiddlywiki/geospatial/docs/save-dom-to-image.tid
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@ -13,7 +13,7 @@ The following parameters are supported:
|!Parameters |!Description | |!Parameters |!Description |
|''selector'' |CSS selector identifying the DOM node to be saved as an image (defaults to `body`) | |''selector'' |CSS selector identifying the DOM node to be saved as an image (defaults to `body`) |
|''format'' |Save format: ''png'', ''jpeg'' or ''svg'' (defaults to ''png'') | |''format'' |Save format: ''png'', ''jpeg'' or ''svg'' (defaults to ''png'') |
|''quality'' |Optional quality 0 to 1 for JPEG images (defaults to 1) | |''quality'' |Optional quality 0 to 1 for JPEG images (note that the default quality is 1, and this default is applied even if the quality is explicitly specified as `0`. To force a low quality JPEG image it is therefore necessary to specify a small non-zero value such as `0.001`) |
|''scale'' |Optional scale factor for the image (defaults to 1) | |''scale'' |Optional scale factor for the image (defaults to 1) |
|''width'' |Optional width of the image in pixels | |''width'' |Optional width of the image in pixels |
|''height'' |Optional height of the image in pixels | |''height'' |Optional height of the image in pixels |
@ -29,7 +29,7 @@ The following parameters are supported:
scale="2" scale="2"
save-file="screenshot.png" save-file="screenshot.png"
/> />
Save the screen as an image file Save the screen as an image file in PNG format
</$button> </$button>
<$button> <$button>
@ -39,9 +39,21 @@ Save the screen as an image file
scale="2" scale="2"
save-title="$:/temp/screenshot.png" save-title="$:/temp/screenshot.png"
/> />
Save the screen as an image tiddler Save the screen as an image tiddler in PNG format
</$button> [[$:/temp/screenshot.png]] </$button> [[$:/temp/screenshot.png]]
<$button>
<$action-sendmessage
$message="tm-save-dom-to-image"
selector="body.tc-body"
format="jpeg"
scale="1"
quality="0.01"
save-title="$:/temp/screenshot.jpeg"
/>
Save the screen as an image tiddler in low quality JPEG format
</$button> [[$:/temp/screenshot.jpeg]]
<$button> <$button>
<$action-sendmessage <$action-sendmessage
$message="tm-save-dom-to-image" $message="tm-save-dom-to-image"