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Black text are not rendering as pure black
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Black text are not rendering as pure black 7 years 2 weeks ago #12222

  • Kin Chung
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I tried to use RenderToBmp(bmp, mat) to render a PDF page to a bitmap.
However, I found that the black text becomes (33, 32, 32) instead of (0, 0, 0)
Are there any settings to make it becomes (0,0,0)?

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Black text are not rendering as pure black 7 years 2 weeks ago #12228

  • nermeen
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We need more information:
Which Radaee SDK version are you using?
On what resolution are you generating the image?
Can you please send us the pdf, and the code you are using?

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Black text are not rendering as pure black 7 years 2 weeks ago #12234

  • Kin Chung
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Here is the PDF file.

And my code is as follow:
int dpi = 300;

float w = doc.GetPageWidth(pageNo) * dpi / 72;
float h = doc.GetPageHeight(pageNo) * dpi / 72;
final Page pdfPage = doc.GetPage(pageNo);
Bitmap bmp = Bitmap.createBitmap((int) w, (int) h, Bitmap.Config.ARGB_8888);
bmp.eraseColor(Color.WHITE);
Matrix mat = new Matrix(dpi/72f, -dpi/72f, 0, h);
pdfPage.RenderToBmp(bmp, mat);
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Black text are not rendering as pure black 7 years 2 weeks ago #12240

  • nermeen
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We have tried your pdf, with the latest version 3.12RC and the bitmap is generated correctly

Document document = new Document();
PDFAssetStream m_asset_stream = new PDFAssetStream();
m_asset_stream.open(getAssets(), "eNAR1.pdf");
document.OpenStream(m_asset_stream, "");
Global.mBitmap = Bitmap.createBitmap((int) (document.GetPageWidth(0)), (int)
		(document.GetPageHeight(0)), Bitmap.Config.ARGB_8888);
Page page = document.GetPage(0);
Global.mBitmap.eraseColor(Color.WHITE);
page.RenderToBmp(Global.mBitmap, new Matrix( 1, -1, 0, document.GetPageHeight(0)));
page.Close();
document.Close();
Can you please recheck with the latest version?
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Black text are not rendering as pure black 7 years 1 week ago #12268

  • Kin Chung
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I tested 3.12 RC12 with RDPDFReader Sample app
However, it is still rendering grey instead of black

Here is the screenshot of the file opened attached.

My Device : Samsung Galaxy Tab S2 (SM-T813), Android 6.0.1
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Black text are not rendering as pure black 7 years 1 week ago #12269

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Are you using the code below? using this code we cannot reproduce the grey text, as you can see in the screenshot
We have tested on Samsung Galaxy Tab S (6.0.1)
Global.mBitmap = Bitmap.createBitmap((int) (document.GetPageWidth(0)), (int)
		(document.GetPageHeight(0)), Bitmap.Config.ARGB_8888);
Page page = document.GetPage(0);
Global.mBitmap.eraseColor(Color.WHITE);
page.RenderToBmp(Global.mBitmap, new Matrix( 1, -1, 0, document.GetPageHeight(0)));
page.Close();
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Last edit: by nermeen.
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