[sane-devel] [janitorial] New backend: escl

[Till Kamppeter]

On 15/12/2019 15:43, thierry at ordissimo.com wrote:
> Le 2019-12-15 18:34, Ulf Zibis a écrit :
>> Hi List,
>>
>> Am 15.12.19 um 09:10 schrieb Olaf Meeuwissen:
>>>
>>> The backend currently only supports image data transfer in JPEG format
>>> but Thierry indicated he wanted to add support for PNG and PDF as well.
>>
>> Would it be possible to also support the TIFF format, as for black&white
>> it is the best compressing with Fax G4 compression?
> 
> I didn't see any device managing Tiff, send me the capability file, I could add 
> the support.
> curl http://<ip>:<port>/eSCL/ScannerCapabilities
> or
> curl -k https://<ip>:<port>/eSCL/ScannerCapabilities
> 

Below is the output of my HP DeskJet 2540, it seems to only support JPEG and 
PDF, so the backend should also support PDF (and if SANE does not support PDF, 
SANE needs either to get appropriately extended (preferred solution) or the 
backend should convert PDF to TIFF, which would not need a PDF interpreter as 
this PDF consists only of bitmaps).

Note that these outputs should not be collected and added to the backend as a 
database, but rather the backend should poll this from the scanner whenever it 
is called.

By the way, the output has PWG in it, so it seems that this eSCL scanning 
standard was developed by or in cooperation with the Printer Working Group.

    Till

----------
<!--  -->
<scan:ScannerCapabilities 
xmlns:scan="http://schemas.hp.com/imaging/escl/2011/05/03" 
xmlns:pwg="http://www.pwg.org/schemas/2010/12/sm" 
xmlns:dest="http://schemas.hp.com/imaging/destination/2011/06/06" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://schemas.hp.com/imaging/escl/2011/05/03 
../../schemas/eSCL-1_92.xsd">
<pwg:Version>2.0</pwg:Version>
<pwg:MakeAndModel>xxxx</pwg:MakeAndModel>
<pwg:SerialNumber>25</pwg:SerialNumber>
<scan:Platen>
<scan:PlatenInputCaps>
<scan:MinWidth>8</scan:MinWidth>
<scan:MaxWidth>2550</scan:MaxWidth>
<scan:MinHeight>8</scan:MinHeight>
<scan:MaxHeight>3508</scan:MaxHeight>
<scan:MaxScanRegions>1</scan:MaxScanRegions>
<scan:SettingProfiles>
<scan:SettingProfile>
<scan:ColorModes>
<scan:ColorMode>Grayscale8</scan:ColorMode>
<scan:ColorMode>RGB24</scan:ColorMode>
</scan:ColorModes>
<scan:ContentTypes>
<pwg:ContentType>Photo</pwg:ContentType>
<pwg:ContentType>Text</pwg:ContentType>
<pwg:ContentType>TextAndPhoto</pwg:ContentType>
</scan:ContentTypes>
<scan:DocumentFormats>
<pwg:DocumentFormat>application/octet-stream</pwg:DocumentFormat>
<pwg:DocumentFormat>image/jpeg</pwg:DocumentFormat>
<pwg:DocumentFormat>application/pdf</pwg:DocumentFormat>
</scan:DocumentFormats>
<scan:SupportedResolutions>
<scan:DiscreteResolutions>
<scan:DiscreteResolution>
<scan:XResolution>75</scan:XResolution>
<scan:YResolution>75</scan:YResolution>
</scan:DiscreteResolution>
<scan:DiscreteResolution>
<scan:XResolution>100</scan:XResolution>
<scan:YResolution>100</scan:YResolution>
</scan:DiscreteResolution>
<scan:DiscreteResolution>
<scan:XResolution>200</scan:XResolution>
<scan:YResolution>200</scan:YResolution>
</scan:DiscreteResolution>
<scan:DiscreteResolution>
<scan:XResolution>300</scan:XResolution>
<scan:YResolution>300</scan:YResolution>
</scan:DiscreteResolution>
<scan:DiscreteResolution>
<scan:XResolution>600</scan:XResolution>
<scan:YResolution>600</scan:YResolution>
</scan:DiscreteResolution>
<scan:DiscreteResolution>
<scan:XResolution>1200</scan:XResolution>
<scan:YResolution>1200</scan:YResolution>
</scan:DiscreteResolution>
<scan:DiscreteResolution>
<scan:XResolution>2400</scan:XResolution>
<scan:YResolution>2400</scan:YResolution>
</scan:DiscreteResolution>
</scan:DiscreteResolutions>
</scan:SupportedResolutions>
<scan:ColorSpaces>
<scan:ColorSpace>YCC</scan:ColorSpace>
<scan:ColorSpace>RGB</scan:ColorSpace>
<scan:ColorSpace>sRGB</scan:ColorSpace>
</scan:ColorSpaces>
</scan:SettingProfile>
</scan:SettingProfiles>
<scan:SupportedIntents>
<scan:Intent>Document</scan:Intent>
<scan:Intent>Photo</scan:Intent>
<scan:Intent>Preview</scan:Intent>
<scan:Intent>TextAndGraphic</scan:Intent>
</scan:SupportedIntents>
<scan:MaxOpticalXResolution>2400</scan:MaxOpticalXResolution>
<scan:MaxOpticalYResolution>2400</scan:MaxOpticalYResolution>
<scan:RiskyLeftMargin>34</scan:RiskyLeftMargin>
<scan:RiskyRightMargin>33</scan:RiskyRightMargin>
<scan:RiskyTopMargin>34</scan:RiskyTopMargin>
<scan:RiskyBottomMargin>46</scan:RiskyBottomMargin>
</scan:PlatenInputCaps>
</scan:Platen>
<scan:BrightnessSupport>
<scan:Min>0</scan:Min>
<scan:Max>2000</scan:Max>
<scan:Step>1</scan:Step>
</scan:BrightnessSupport>
<scan:ContrastSupport>
<scan:Min>0</scan:Min>
<scan:Max>2000</scan:Max>
<scan:Step>1</scan:Step>
</scan:ContrastSupport>
<scan:HighlightSupport>
<scan:Min>0</scan:Min>
<scan:Max>255</scan:Max>
<scan:Normal>179</scan:Normal>
<scan:Step>1</scan:Step>
</scan:HighlightSupport>
<scan:ShadowSupport>
<scan:Min>0</scan:Min>
<scan:Max>255</scan:Max>
<scan:Normal>25</scan:Normal>
<scan:Step>1</scan:Step>
</scan:ShadowSupport>
<scan:SharpenSupport>
<scan:Min>0</scan:Min>
<scan:Max>255</scan:Max>
<scan:Step>1</scan:Step>
</scan:SharpenSupport>
<scan:ThresholdSupport>
<scan:Min>0</scan:Min>
<scan:Max>255</scan:Max>
<scan:Normal>128</scan:Normal>
<scan:Step>1</scan:Step>
</scan:ThresholdSupport>
</scan:ScannerCapabilities>