Hi , Tilman thank you for your reply. Consider upgrading.
Uchida -------------------------------------------------- コベルコシステム株式会社 ソリューション事業部 インダストリーソリューション本部 第２開発部 第２グループ 内田 一之(ウチダカズユキ) TEL：080-9594-1560 E-mail：[email protected] --------------------------------------------------- 送信元: Tilman Hausherr <[email protected]> 宛先: [email protected] 日付: 2021/07/28 12:41 件名: Re: Questions about setting dpi resolution Hi, You could use the source code of ExtractImages (in the source code download) to get the sizes. Btw the current version is 2.0.24. Tilman Am 28.07.2021 um 03:31 schrieb [email protected]: > I want to dynamically specify the dpi specification when converting from > PDF to JEPG file. > > In the case of 300dpi, I changed it to 72dpi because Out of Memoey > occurred in the PDF that retained the image. In that case, the characters > were crushed in the JPEG file that output only the text, and it became > difficult to see. > > Is there a way to see if there is an image in the PDF file attributes or > to see the pixel value? > > implementation 'org.apache.pdfbox:pdfbox:2.0.23' > > code > ---------------------------------------------------------------------- > try (ByteArrayOutputStream baos = new ByteArrayOutputStream(); > ImageOutputStream ios = ImageIO.createImageOutputStream(baos);) { > > bufferedImage = pdfRenderer.renderImageWithDPI(i, 300, ImageType.RGB); > > ImageWriter writer = > ImageIO.getImageWritersByFormatName("jpeg").next(); > writer.setOutput(ios); > > JPEGImageWriteParam jpegParams = new JPEGImageWriteParam(null); > jpegParams.setCompressionMode(ImageWriteParam.MODE_EXPLICIT); > > writer.write(null, new IIOImage(bufferedImage, null, null), > jpegParams); > writer.dispose(); > > imageDataList.add(baos.toByteArray()); > } catch (IOException e) { > return PDF_CONVERT_ERROR; > } finally { > if (bufferedImage != null) { > bufferedImage.getGraphics().dispose(); > bufferedImage = null; > } > } > > ---------------------------------------------------------------------- > > > -------------------------------------------------- > コベルコシステム株式会社 > ソリューション事業部 > インダストリーソリューション本部 > 第２開発部 第２グループ > 内田 一之(ウチダカズユキ) > TEL：080-9594-1560 > E-mail：[email protected] > --------------------------------------------------- > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
