Many thanks for your answer. On Thursday, January 10, 2013 7:57:24 AM UTC+7, TP wrote: > > On Tue, Jan 8, 2013 at 7:58 PM, newbie <duon...@gmail.com <javascript:>> > wrote: > > BTW, I just have one more question regarding the pixCreate. Is it > default > > set the bitmap resolution to 300 DPI even though I create the pix* from > the > > bmp with 96 DPI? > > I saved the tiff file to disk and see it has 300 DPI. But if I manually > set > > the xRes & yRes to 96, then it has 96 DPI of resolution. I don't if it > is > > expectation for DPI. > > Take a look at tiffio.c. You'll see lines like: > > static const l_int32 DEFAULT_RESOLUTION = 300; /* ppi */ > > if (xres == 0) xres = DEFAULT_RESOLUTION; > if (yres == 0) yres = DEFAULT_RESOLUTION; > > so the answer would seem to be yes. > > > Sometime, I would like to resample the bitmap which has low resolution > and > > set to 300 DPI for input bitmap of Tesseract OCR. Could you advise me? > > For a discussion of leptonica's image scaling support see "Image > Scaling" [1], and in particular "Summary of scaling functions in > leptonica" [2]. See prog/scaletest1.c, prog/scaletest2.c, and > prog/scale_reg.c for example usage. > > [1] http://tpgit.github.com/UnOfficialLeptDocs/leptonica/scaling.html > > [2] > http://tpgit.github.com/UnOfficialLeptDocs/leptonica/scaling.html#summary-of-scaling-functions-in-leptonica > >
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