Clarify expectactions for toDataURL() and toBlob()
#125
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hdr_html_canvas_element.md
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| @@ -162,6 +162,10 @@ not quantized, i.e. R' = 0.5 is represented by the floating point value 0.5. | |||
| _NOTE: `dataType = "unorm8"` corresponds to HTML Canvas as it exists today and | |||
| should not be used to represent HDR signal, as detailed in the introduction._ | |||
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| The `HTMLCanvasElement` methods `toDataURL()` and `toBlob()` should produce | |||
| resources that best match the fidelity of the underlying HTML Canvas element | |||
| (subject to the limitations of the implementation and the requested format). | |||
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That seems a bit vague, hand-wavy and hard to test.
It seems better to crisply state that the color space of the 2D context should be preserved in toDataURL() and toBlob(). (And yes, if the requested format can't do that then there is an issue, but all common formats can represent that information).
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How can it be made less vague without providing a specific mapping to each format, which the Web Platform does not do today? |
By explicitly stating that the color space of the Canvas context should be preserved, rather than vaguely mentioning "fidelity"
The mechanism by which each format does this need not be specified in detail. There are two common cross-format methods in use and my suggested text mentions both as examples. |
Co-authored-by: Chris Lilley <[email protected]>
Co-authored-by: Chris Lilley <[email protected]>
Closes #119