The font of the content in the PDF to PNG conversion is SourceHanSansHWSC-Regular.otf font, and the PNG image is garbled after conversion.
Use font package for Source Black OTF
If the font is correct when converting Word to HTML, but the file layout is incorrect, it indicates that the server can convert fonts normally
湖北大峪口化主有限责任公司大峪口磷矿160_万吨年地下采矿工程项目智能化矿山建设交流方案20250413.docx (10.9 KB)
When converting a PDF to PNG using Aspose.PDF for Java, if you encounter garbled text, particularly with specific fonts like Source Black, it may be due to font embedding issues. Here are some steps you can take to address this problem:
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Ensure Font Availability: Make sure that the Source Black font is properly installed and accessible on the server where the conversion is taking place. If the font is not available, Aspose may substitute it with a default font, leading to garbled text.
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Embed Fonts in PDF: If possible, ensure that the PDF document has the fonts embedded. This can help maintain the correct appearance during conversion. You can check this by opening the PDF in a viewer that shows font information.
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Use the Correct Conversion Code: Below is a sample code snippet for converting PDF pages to PNG images using Aspose.PDF for Java. This code ensures that the conversion is done at a specified resolution, which can help improve the output quality:
import java.io.IOException; import com.aspose.pdf.Document; import com.aspose.pdf.devices.PngDevice; import com.aspose.pdf.devices.Resolution; public class ConvertPDFPagesToPNGImages { public static void main(String[] args) throws IOException { convertAllPDFPagesToPNGImages(); } public static void convertAllPDFPagesToPNGImages() throws IOException { // Open the PDF document Document pdfDocument = new Document("input.pdf"); // Loop through all the pages of the PDF file for (int pageCount = 1; pageCount <= pdfDocument.getPages().size(); pageCount++) { // Create stream object to save the output image java.io.OutputStream imageStream = new java.io.FileOutputStream("Converted_Image" + pageCount + ".png"); // Create Resolution object Resolution resolution = new Resolution(300); // Create PngDevice object with the specified resolution PngDevice pngDevice = new PngDevice(resolution); // Convert a particular page and save the image to stream pngDevice.process(pdfDocument.getPages().get_Item(pageCount), imageStream); // Close the stream imageStream.close(); } } } -
Check for Layout Issues: If the layout is incorrect when converting from Word to HTML but correct in other formats, it may indicate that the conversion settings or the document structure needs adjustment. Review the document’s formatting and ensure that it is compatible with the conversion process.
If the issue persists after trying these steps, consider reaching out to Aspose support with specific details about the PDF file and the environment setup for further assistance.
Sources:
[1]: ConvertPDFPagesToPNGImages.java
Are you using Aspose.PDF for Java and have you tried with the latest version of the API? Can you please share this information and confirm if we can test using the same code that has been shared above?
@asad.ali Yes, I have the same problem using the latest dependency transformation.
You can use the font package above and the code below for testing, which contains some of our business code. Could you please manually remove it
PngDevice png = null;
PageCollection pageCollection = null;
Integer imgResolution = sourceFile.getImgResolution();
int resolution = imgResolution==null ? 100 : imgResolution;
try {
png = new PngDevice(new Resolution(resolution));
pageCollection = pdf.getPages();
} catch (Throwable throwable) {
if (throwable instanceof ThreadDeath || throwable instanceof OutOfMemoryError) {
throw throwable;
} else {
throw new Exception(“aspose_setting”, throwable);
}
}
int picPageCount = 0;
try {
picPageCount = pageCollection.size();
} catch (Throwable throwable) {
if (throwable instanceof ThreadDeath || throwable instanceof OutOfMemoryError) {
throw throwable;
} else {
throw new Exception(“aspose_getPageCount”, throwable);
}
}
TicAsposeConvertProgressUtil.setConvertProgress(sourceFile.getTaskId(), picPageCount, 0);
ConvertResultFiles convertResultFiles = new ConvertResultFiles(picPageCount);
convertResult.getResultFilesMap().put("png",convertResultFiles);
String pageKey_pre = "page-";
String fileKey = null;
IConvertFile pageConvertFile = null;
for (int i = 1; i <= picPageCount; i++) {
fileKey = pageKey_pre+i;
try {
log.debug("文件-" + sourceFile.getFileName() + "-第" + i + "页转换图片开始");
try {
pageConvertFile = sourceFile.newConvertFile("png", fileKey, null);
} catch (Throwable throwable) {
if (throwable instanceof ThreadDeath || throwable instanceof OutOfMemoryError) {
throw throwable;
} else {
throw new Exception("createConvertFile", throwable);
}
}
Page page = null;
try {
// compressImage(png.processToBufferedImage(pageCollection.get_Item(i)), sourceFile, pageConvertFile,
// true);
page = pageCollection.get_Item(i);
BufferedImage bufferedImage = png.processToBufferedImage(page);
ImageIOUtil.writeImage(bufferedImage, “png”, pageConvertFile.getOutputStream());
// if (i == 1) {
// generateThumbnail(pageConvertFile, sourceFile);
// }
} catch (Throwable throwable) {
if (throwable instanceof ThreadDeath || throwable instanceof OutOfMemoryError) {
throw throwable;
} else {
throw new Exception(“aspose_convert”, throwable);
}
} finally {
page.close();
}
log.debug(“文件-” + sourceFile.getFileName() + “-第” + i + “页转换图片结束”);
convertResultFiles.addSuccessResult(pageConvertFile.getFileKey(),pageConvertFile.getPath());
TicAsposeConvertProgressUtil.setConvertProgress(sourceFile.getTaskId(), picPageCount, i);
} catch (Throwable throwable) {
convertResultFiles.addErrorResult(fileKey,throwable.getMessage());
throw throwable;
} finally {
//System.gc();
}
}
We are not able to download the PDF file that you attached above. Can you please attach it again so that we can test the scenario in our environment and address it accordingly.
We have opened the following new ticket(s) in our internal issue tracking system and will deliver their fixes according to the terms mentioned in Free Support Policies.
Issue ID(s): PDFJAVA-45006
You can obtain Paid Support Services if you need support on a priority basis, along with the direct access to our Paid Support management team.