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Ralf
120 Posts |
 Posted - Apr 03 2017 : 11:04:09
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Hi Nigel,
i tried to scan per WIA and set the color to Full Color. The Result is, that the scan is only in Gray when i doesn't use the Acquisition Dialog. When i use the dialog the scan is in Color.
Have you any idear?
Thanks
Ralf |
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Ralf
120 Posts |
Posted - Apr 04 2017 : 04:46:50
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Hi Nigel,
i made a few more test's Setting
AcquireParams.PixelType:= TIEAcquirePixelType( cmbColors.ItemIndex );
doesn't change the PixelType of the Scanner. Only the Acquisition Dialog can change the Color.
Ralf |
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Ralf
120 Posts |
Posted - Apr 04 2017 : 05:27:52
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Hi Nigel,
using
case color of
1: Val:=WIA_INTENT_IMAGE_TYPE_GRAYSCALE;{Grau}
2: Val:=WIA_INTENT_IMAGE_TYPE_COLOR; {Farbe}
else Val:=WIA_INTENT_IMAGE_TYPE_Text; {S/W}
end;
wiaParams.SetItemProperty(WIA_IPS_Cur_Intent, Val);
case color of
1: Val:=WIA_DATA_GRAYSCALE;{Grau}
2: Val:=WIA_DATA_COLOR; {Farbe}
else Val:=WIA_DATA_THRESHOLD;{S/W}
end;
wiaParams.SetItemProperty(WIA_IPA_DATATYPE, Val);
can set the Color!
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xequte
38610 Posts |
Posted - Apr 04 2017 : 16:47:16
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Hi Ralf
Do you need to set both of these properties?
What is the make and model of the scanner?
Nigel
Xequte Software
www.xequte.com
nigel@xequte.com
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Ralf
120 Posts |
Posted - Apr 05 2017 : 00:34:47
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Hi Nigel,
at the moment i didn't know any scanner your version did work.
We tested with Brother ADS 2400N, Fujitsu fi-6110, OKI 873.
I can test later on in office in about 2 houers it we need both or for example the first is enough to get the correct result.
Regards
Ralf |
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Ralf
120 Posts |
Posted - Apr 05 2017 : 02:25:28
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Hi Nigel,
i tried only setting the first parameter
case color of
1: Val:=WIA_INTENT_IMAGE_TYPE_GRAYSCALE;{Grau}
2: Val:=WIA_INTENT_IMAGE_TYPE_COLOR; {Farbe}
else Val:=WIA_INTENT_IMAGE_TYPE_Text; {S/W}
end;
wiaParams.SetItemProperty(WIA_IPS_Cur_Intent, Val);
and the setting of the color works.
Witch more information to the used scanner do you want to know?
Regards
Ralf |
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Ralf
120 Posts |
Posted - Apr 05 2017 : 03:38:40
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Hi Nigel,
i'm at the moment looking in your source code to find what is different to my code.
By looking inside the AllAcqure Demo i found, that you save the new Properties befor you do the Acquire (inside the btnAcquire). In the "Save Parameters" Button you do also, after the saving, a "UpdateControlStatus".
That is the reason why i didn't see, that the changing of Color didn't work and it was set back to the old value. Maybe you implement in your demo for the Acquire Button also an Update.
Best Regards
Ralf |
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xequte
38610 Posts |
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Ralf
120 Posts |
Posted - May 01 2017 : 11:13:35
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Hi Nigel,
setting the Color this way work:
case color of
1: Val:=WIA_INTENT_IMAGE_TYPE_GRAYSCALE;{Grau}
2: Val:=WIA_INTENT_IMAGE_TYPE_COLOR; {Farbe}
else Val:=WIA_INTENT_IMAGE_TYPE_Text; {S/W}
end;
wiaParams.SetItemProperty(WIA_IPS_Cur_Intent, Val);
You should implement that way for setting the Color of the Scan in your Demo.
Best Regards
Ralf |
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xequte
38610 Posts |
Posted - May 01 2017 : 17:29:29
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Hi Ralf
So does it work if you change iexAcquire.pas as follows:
procedure TIEAcquireParams.SetPixelType(v : TIEAcquirePixelType);
var
iBitsPerChannel: Integer;
begin
case SelectedSourceApi of
ieaTwain : begin
iBitsPerChannel := -1;
case v of
ieapMonochrome : begin
fTwainParams.PixelType.CurrentValue := Twain_PixelType_BW;
end;
ieap8BitGrayScale : begin
fTwainParams.PixelType.CurrentValue := Twain_PixelType_Grayscale;
iBitsPerChannel := 8;
end;
ieap16BitGrayScale : begin
fTwainParams.PixelType.CurrentValue := Twain_PixelType_Grayscale;
iBitsPerChannel := 16;
end;
ieapFullColor : begin
fTwainParams.PixelType.CurrentValue := Twain_PixelType_FullRGB;
// Note: Some manufaturers incorrectly treat full color images as BitDepth of 24
if ScannerTreatsBitDepthAsPerChannel then
iBitsPerChannel := 8
else
iBitsPerChannel := 24;
end;
ieapFullColor16 : begin
fTwainParams.PixelType.CurrentValue := Twain_PixelType_FullRGB;
if ScannerTreatsBitDepthAsPerChannel then
iBitsPerChannel := 16
else
iBitsPerChannel := 48;
end;
ieapOther : begin { Ignore } end;
end;
if ( iBitsPerChannel > -1 ) and
( fTwainParams.BitDepth.IndexOf( iBitsPerChannel ) >= 0 ) then
fTwainParams.BitDepth.CurrentValue := iBitsPerChannel;
end;
ieaWIA : case v of
ieapMonochrome : begin
fWiaParams.SetItemProperty(WIA_IPA_BITS_PER_CHANNEL, 1);
fWiaParams.SetItemProperty(WIA_IPA_CHANNELS_PER_PIXEL, 1);
fWiaParams.SetItemProperty(WIA_IPS_CUR_INTENT, WIA_INTENT_IMAGE_TYPE_GRAYSCALE);
end;
ieap8BitGrayScale : begin
fWiaParams.SetItemProperty(WIA_IPA_BITS_PER_CHANNEL, 8);
fWiaParams.SetItemProperty(WIA_IPA_CHANNELS_PER_PIXEL, 1);
fWiaParams.SetItemProperty(WIA_IPS_CUR_INTENT, WIA_INTENT_IMAGE_TYPE_GRAYSCALE);
end;
ieap16BitGrayScale : begin
fWiaParams.SetItemProperty(WIA_IPA_BITS_PER_CHANNEL, 16);
fWiaParams.SetItemProperty(WIA_IPA_CHANNELS_PER_PIXEL, 1);
fWiaParams.SetItemProperty(WIA_IPS_CUR_INTENT, WIA_INTENT_IMAGE_TYPE_GRAYSCALE);
end;
ieapFullColor : begin
fWiaParams.SetItemProperty(WIA_IPA_BITS_PER_CHANNEL, 8);
fWiaParams.SetItemProperty(WIA_IPA_CHANNELS_PER_PIXEL, 3);
fWiaParams.SetItemProperty(WIA_IPS_CUR_INTENT, WIA_INTENT_IMAGE_TYPE_COLOR);
end;
ieapFullColor16 : begin
fWiaParams.SetItemProperty(WIA_IPA_BITS_PER_CHANNEL, 16);
fWiaParams.SetItemProperty(WIA_IPA_CHANNELS_PER_PIXEL, 3);
fWiaParams.SetItemProperty(WIA_IPS_CUR_INTENT, WIA_INTENT_IMAGE_TYPE_COLOR);
end;
ieapOther : begin { Ignore } end;
end;
{ ieaDCIM : N/A }
end;
end;
Nigel
Xequte Software
www.xequte.com
nigel@xequte.com
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Ralf
120 Posts |
Posted - May 02 2017 : 02:15:52
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Hi Nigel,
i tried your changes. Is there a reason why you also use WIA_Intent_Image_Type Grayscale by black and white and not for example WIA_INTENT_IMAGE_TYPE_Text.
When i scan a A4 Testpage with Twain Black and White the page has 22 kb.
When i do the same with WIA
Black and White WIA_INTENT_IMAGE_TYPE_Text 17 kb
Black and White WIA_INTENT_IMAGE_TYPE_GRAYSCALE 137 kb
Gray WIA_INTENT_IMAGE_TYPE_GRAYSCALE 210 kb
The quality of Twain Black and White is better then the Quality of WIA (as WIA_INTENT_IMAGE_TYPE_Text).
Maybe I can get a better result if i have a look on WIA_DATA_Threshold.
Ralf |
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xequte
38610 Posts |
Posted - May 02 2017 : 19:47:02
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Hi Ralf
According to the Microsoft documentation, WIA_INTENT_IMAGE_TYPE_TEXT is intended only when text is being scanned, so using it in a non-standard way (to denote monochrome) may cause inconsistent results across devices/drivers.
Nigel
Xequte Software
www.xequte.com
nigel@xequte.com
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Ralf
120 Posts |
Posted - May 03 2017 : 02:17:17
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Hi Nigel,
thanks for your Feedback. The Quality using WIA_INTENT_IMAGE_TYPE_TEXT is not so good as using .._TYPE_GRAYSCALE. The size of the resulting image using Grayscale is much bigger.
The Size of ...TYPE_Text is nearly the same as scanning Black and White over Twain.
We will see what we use for scanning.
Ralf |
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AllAcquire.exe Wia only Scan Gray
