Legacy ImageMagick Discussions Archive

I use the imagemagick++ API in my C++ programm. Readimage is used to read a multi-pages PDF file. But the resolution of the output image is too low.

vector<Image> imageList;
readImages( &imageList, "E:/ww.pdf" );
for(int i = 0; i < imageList.size(); i++)
{imageList.density("300");}
writeImages( imageList.begin(), imageList.end(), "D:/yes.tif" );

Is there some solutions to improve the resolution.

You need to assign the density before reading the image. You cannot do that with readImages right now. But if you inline the content of readImages it can be done:

Code: Select all

// Not tested:
MagickCore::ImageInfo *imageInfo = MagickCore::CloneImageInfo(0);

std::string imageSpec =  "E:/ww.pdf";
imageSpec.copy(imageInfo->filename, MaxTextExtent-1);
imageInfo->filename[imageSpec.length()] = 0;
MagickCore::CloneString(&imageInfo->density, "300");

MagickCore::ExceptionInfo exceptionInfo;
MagickCore::GetExceptionInfo(&exceptionInfo);
MagickCore::Image* images = MagickCore::ReadImage(imageInfo, &exceptionInfo);
MagickCore::DestroyImageInfo(imageInfo);
Magick::insertImages(imageList, images);
Magick::throwException(exceptionInfo);
MagickCore::DestroyExceptionInfo(&exceptionInfo);

Legacy ImageMagick Discussions Archive

Readimage low resolution C++

Readimage low resolution C++

Re: Readimage low resolution C++