PDF Optimize
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PDF Optimize
Hello,
We know tracker provide a operation allows to optimize the PDF document and this is the sample code:
https://sdkhelp.pdf-xchange.com/vie ... t_optimize. i noticed that the parameter named 'Options' contains many sub-parameters which can make diffrent optimized document.i wonder the meaning of the method called 'Zip' in Images->Comp->Method ,can i use it make a zip file or not?
We know tracker provide a operation allows to optimize the PDF document and this is the sample code:
https://sdkhelp.pdf-xchange.com/vie ... t_optimize. i noticed that the parameter named 'Options' contains many sub-parameters which can make diffrent optimized document.i wonder the meaning of the method called 'Zip' in Images->Comp->Method ,can i use it make a zip file or not?
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Re: PDF Optimize
Hello HomerWu,
ZIP is a compression method not a file, meaning that ZIP compression will be used for the fullcolor image compression.
Cheers,
Alex
ZIP is a compression method not a file, meaning that ZIP compression will be used for the fullcolor image compression.
Cheers,
Alex
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Re: PDF Optimize
Hello Sasha,
Thank you for your reply.But I have other two questions that need to consult you:
1.I found your parameter 'JPEGQuality' contains a value 'Lossless',but when i use it to optimize pdf,i found the iamge changed,can your SDK make a lossless compression picture?
2.Please have a look at my attachment,'1.pdf ' is the original file and '2.pdf' is the compressed document by other soft,I would like to use your SDK to compress PDF and achieve that effect,but failed, i use JPEG2000+Lossless and dpi above is 225 and dpi to is 150,Do you have any suggestions for me?
Thank you for your reply.But I have other two questions that need to consult you:
1.I found your parameter 'JPEGQuality' contains a value 'Lossless',but when i use it to optimize pdf,i found the iamge changed,can your SDK make a lossless compression picture?
2.Please have a look at my attachment,'1.pdf ' is the original file and '2.pdf' is the compressed document by other soft,I would like to use your SDK to compress PDF and achieve that effect,but failed, i use JPEG2000+Lossless and dpi above is 225 and dpi to is 150,Do you have any suggestions for me?
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Re: PDF Optimize
Hello HomerWu,
Well, you have decreased the dpi thus the downsampling took place. Also, please clarify what image exactly are you talking about?
Cheers,
Alex
Well, you have decreased the dpi thus the downsampling took place. Also, please clarify what image exactly are you talking about?
Cheers,
Alex
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Re: PDF Optimize
Hello Sasha,
Yes,i decreased the dpi from 225 to 150,on color images and grayscale images.the file size becomes smaller,but the the quality of the document is also worse .what i want to do is to make the file smaller,with a little(or no) quality change,do you have any good ideas?
Yes,i decreased the dpi from 225 to 150,on color images and grayscale images.the file size becomes smaller,but the the quality of the document is also worse .what i want to do is to make the file smaller,with a little(or no) quality change,do you have any good ideas?
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Re: PDF Optimize
Hi Homer,
As Sasha exlpained, the loss in quality is because you lowered the DPI of the image. If you want to retain the image quality, then you will need to compress the image without downsampling. This is done by selecting 'No Downsampling':
https://sdkhelp.pdf-xchange.com/vie ... ze_Options
As Sasha exlpained, the loss in quality is because you lowered the DPI of the image. If you want to retain the image quality, then you will need to compress the image without downsampling. This is done by selecting 'No Downsampling':
https://sdkhelp.pdf-xchange.com/vie ... ze_Options
If posting files to this forum, you must archive the files to a ZIP, RAR or 7z file or they will not be uploaded.
Thank you.
Best regards
Will Travaglini
Tracker Support (Europe)
Tracker Software Products Ltd.
http://www.tracker-software.com
Thank you.
Best regards
Will Travaglini
Tracker Support (Europe)
Tracker Software Products Ltd.
http://www.tracker-software.com
Re: PDF Optimize
Hello Will,
Thank you for your quick reply.
As you said,i changed my code as below:
the new method created a optimized file,but when i open and zoomed it to 400%,the picture is no longer smooth around,Is my code wrong?
Thank you for your quick reply.
As you said,i changed my code as below:
Code: Select all
public bool OptimizePDF(string filePath)
{
PDFXEdit.IPXV_Inst Inst = this.pdfCtl.Inst;
int nID = Inst.Str2ID("op.document.optimize", false);
PDFXEdit.IOperation Op = Inst.CreateOp(nID);
var input = Op.Params.Root["Input"];
PDFXEdit.IAFS_Inst fsInst = (PDFXEdit.IAFS_Inst)Inst.GetExtension("AFS");
PDFXEdit.IAFS_Name impPath = fsInst.DefaultFileSys.StringToName(filePath);
PDFXEdit.IPXC_Inst pxcInst = (PDFXEdit.IPXC_Inst)Inst.GetExtension("PXC");
PDFXEdit.IPXC_Document resDoc = pxcInst.OpenDocumentFrom(impPath, null);
//Then pass it to the optimization operation
input.Add().v = resDoc;
PDFXEdit.ICabNode options = Op.Params.Root["Options"];
//Images
PDFXEdit.ICabNode images = options["Images"];
//DiscardObjects
PDFXEdit.ICabNode discardObjects = options["DiscardObjects"];
//DiscardUserData
PDFXEdit.ICabNode discardUserData = options["DiscardUserData"];
//CleanUp
PDFXEdit.ICabNode cleanup = options["CleanUp"];
images["Enabled"].v = true;
images["ReducedOnly"].v = true;
PDFXEdit.ICabNode comp = images["Comp"];
PDFXEdit.ICabNode scale = images["Scale"];
scale["Color.Method"].v = 0;
//scale["Color.To"].v = scaleColorTo;
//scale["Color.IfAbove"].v = scaleColorIfAbove;
comp["Color.JPEGQuality"].v = 5;
comp["Color.Method"].v = 1;
//灰度图
scale["Grayscale.Method"].v = 0;
//scale["Grayscale.To"].v = scaleGrayscaleTo;
//scale["Grayscale.IfAbove"].v = scaleGrayscaleIfAbove;
comp["Grayscale.JPEGQuality"].v = 5;
comp["Grayscale.Method"].v = 1;
//索引图
//scale["Indexed.Method"].v = scaleIndexedMethod;
//scale["Indexed.To"].v = scaleIndexedTo;
//scale["Indexed.IfAbove"].v = scaleIndexedIfAbove;
//comp["Indexed.Method"].v = comIndexedMethod;
// 黑白图
scale["Mono.Method"].v = 0;
//scale["Mono.To"].v = scaleMonoTo;
//scale["Mono.IfAbove"].v = scaleMonoIfAbove;
comp["Mono.Method"].v = 0;
//忽略对象
discardObjects["Flags"].v = discard;
//忽略用户数据
discardUserData["Flags"].v = discardUser;
//清除
cleanup["Flags"].v = clear;
Op.Do();
resDoc.WriteTo(impPath);
value = true;
}
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Re: PDF Optimize
Hello HomerWu,
Well you are using the optimization - it will reduce the data quality from the first place. Anyways it's up to you to experiment and choose the best quality/size settings.
Cheers,
Alex
Well you are using the optimization - it will reduce the data quality from the first place. Anyways it's up to you to experiment and choose the best quality/size settings.
Cheers,
Alex
Subscribe at:
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Re: PDF Optimize
Hello Sasha,
But as will said 'If you want to retain the image quality, then you will need to compress the image without downsampling',now i set the Color.Method to 0(No downsampling)、Color.Method to 0(Retain existing)、Color.JPEGQuality to 5(Lossless),and the Grayscale is same. Why when i open and zoomed it to 400%,the picture is no longer smooth around?please have a look at my three attachments.
But as will said 'If you want to retain the image quality, then you will need to compress the image without downsampling',now i set the Color.Method to 0(No downsampling)、Color.Method to 0(Retain existing)、Color.JPEGQuality to 5(Lossless),and the Grayscale is same. Why when i open and zoomed it to 400%,the picture is no longer smooth around?please have a look at my three attachments.
- Attachments
-
- OceanFax_High Avaliability_HotSync_20161020.pdf
- (2.6 MiB) Downloaded 64 times
-
- OceanFax_High Avaliability_HotSync_20161020_Optimized.pdf
- (505.14 KiB) Downloaded 66 times
-
- OceanFax_High Avaliability_HotSync_20161020_OptimizedByPDFXChange.pdf
- (703.31 KiB) Downloaded 69 times
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Re: PDF Optimize
Hello HomerWu,
Have you tried all of these settings in the End-User Editor?
Cheers,
Alex
Have you tried all of these settings in the End-User Editor?
Cheers,
Alex
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Re: PDF Optimize
Hello Sasha,
Yes,I promise I tried all of these settings in the PDF-XChange Editor,and i also tried all of these settings in my code,because this feature is important for us.We need an optimization function that contains three levels,and now the low and the medium levels have been completed,but the high level which can make the file smaller,with a little(or no) quality change is difficult for me.
Yes,I promise I tried all of these settings in the PDF-XChange Editor,and i also tried all of these settings in my code,because this feature is important for us.We need an optimization function that contains three levels,and now the low and the medium levels have been completed,but the high level which can make the file smaller,with a little(or no) quality change is difficult for me.
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Re: PDF Optimize
Hello HomerWu,
I'm afraid that you will have to try different methods for yourself, compare the results and choose the best one - we can't possibly know what do you want to achieve.
Cheers,
Alex
I'm afraid that you will have to try different methods for yourself, compare the results and choose the best one - we can't possibly know what do you want to achieve.
Cheers,
Alex
Subscribe at:
https://www.youtube.com/channel/UC-TwAMNi1haxJ1FX3LvB4CQ
https://www.youtube.com/channel/UC-TwAMNi1haxJ1FX3LvB4CQ