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How to do JPEG Compression Save at 10
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How to do JPEG Compression Save at 10
by prasadtv
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Hi All, I am using JMagick to resize JPG images. I am able to resize to any specified size. The problem is, I want to save the generated image using JPEG Compression "10". By default JMagick saves the images in JPEG Compression "12". But I want to save the generated image using JPEG Compression "10" and JPEG Compression "5" also. Please let me know any body has solution for this. It will be great help for me, if some one helps on this... I am using the following code to resize: ImageInfo info = new ImageInfo(); MagickImage blobImage = new MagickImage(info, srcImageData); blobImage.setFilter(FilterType.HermiteFilter); MagickImage scaled = blobImage.zoomImage(imgWidth, imgHeight); processedImageData = scaled.imageToBlob(info); scaled.setFileName("F:\\imagestoprocess\\GeneratedImages\\shd0112l.jpg"); scaled.writeImage(info); Thanks & regards Prasad T.V ----------------------------------------------------------------------------------------------------------------------------- Disclaimer ----------------------------------------------------------------------------------------------------------------------------- "This message(including attachment if any)is confidential and may be privileged.Before opening attachments please check them for viruses and defects.MindTree Consulting Private Limited (MindTree)will not be responsible for any viruses or defects or any forwarded attachments emanating either from within MindTree or outside.If you have received this message by mistake please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this message in whole or in part is strictly prohibited. Please note that e-mails are susceptible to change and MindTree shall not be liable for any improper, untimely or incomplete transmission." ----------------------------------------------------------------------------------------------------------------------------- _______________________________________________ JMagick mailing list JMagick@... http://www.yeo.id.au/mailman/listinfo/jmagick |
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Re: How to do JPEG Compression Save at 10
by Jin Zhao
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I guess you need implement the get/set methods for jpeg image quality in
JMagick image class. You may add the following code, rebuild jmagick and start testing. ################ MagickImage.java ################ public native int getQuality() throws MagickException; public native void setQuality(int value) throws MagickException; ################ MagickImage.java ################ ################ magick_MagickImage.c ################ getIntMethod(Java_magick_MagickImage_getQuality, quality, "magickImageHandle", Image) setIntMethod(Java_magick_MagickImage_setQuality, quality, "magickImageHandle", Image) ################ magick_MagickImage.c ################ In your code, you may try something like this. ############################################ int quality = 90; scaled.setQuality(quality); ############################################ Please let me know how well this can work for you. Thanks, Jin On Mon, 12 Sep 2005, Prasad TV wrote: > Hi All, > > I am using JMagick to resize JPG images. I am able to resize to any specified > size. The problem is, I want to save the generated image using JPEG > Compression "10". By default JMagick saves the images in JPEG Compression > "12". But I want to save the generated image using JPEG Compression "10" and > JPEG Compression "5" also. Please let me know any body has solution for this. > > > It will be great help for me, if some one helps on this... > > I am using the following code to resize: > > ImageInfo info = new ImageInfo(); > > MagickImage blobImage = new MagickImage(info, srcImageData); > > blobImage.setFilter(FilterType.HermiteFilter); > > MagickImage scaled = blobImage.zoomImage(imgWidth, imgHeight); > > processedImageData = scaled.imageToBlob(info); > > scaled.setFileName("F:\\imagestoprocess\\GeneratedImages\\shd0112l.jpg"); > > scaled.writeImage(info); > > Thanks & regards > > Prasad T.V > > JMagick mailing list JMagick@... http://www.yeo.id.au/mailman/listinfo/jmagick |
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Re: How to do JPEG Compression Save at 10
by Eric Yeo
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On Mon, 2005-09-12 at 14:44 +0530, Prasad TV wrote:
> Hi All, > > I am using JMagick to resize JPG images. I am able to resize to any > specified size. The problem is, I want to save the generated image > using JPEG Compression "10". By default JMagick saves the images in > JPEG Compression "12". But I want to save the generated image using > JPEG Compression "10" and JPEG Compression "5" also. Please let me > know any body has solution for this. > > It will be great help for me, if some one helps on this... > > I am using the following code to resize: > > ImageInfo info = new ImageInfo(); > > MagickImage blobImage = new MagickImage(info, srcImageData); > > blobImage.setFilter(FilterType.HermiteFilter); > > MagickImage scaled = blobImage.zoomImage(imgWidth, imgHeight); > > processedImageData = scaled.imageToBlob(info); > > scaled.setFileName("F:\\imagestoprocess\\GeneratedImages\ > \shd0112l.jpg"); > > scaled.writeImage(info); Before calling writeImage, use the setQuality method in ImageInfo, e.g. info.setQuality(XX); scaled.writeImage(info); Please note that the quality value range from 1 to 100 (I think). Someone please confirm. Regards, Eric _______________________________________________ JMagick mailing list JMagick@... http://www.yeo.id.au/mailman/listinfo/jmagick |
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RE: How to do JPEG Compression Save at 10
by Eric Yeo
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On Wed, 2005-09-14 at 15:22 +0530, Prasad TV wrote:
> Hi Eric, > > As you said I tried by setting quality for info object before write to file. > But when I open that new image in photo shop it allways shows saved as 12. > But I want to save the file as 10. I tried with different values for quality > between 1 to 100. I don't believe that the quality is stored with the image. If you set the quality value to something low in JMagick, the image will have low quality. > One more Quick Question, How do I set the DPI while saving an image? Please read the comments in the code or generate the Javadoc. Use the MagickImage#setXResolution and/or MagickImage#setYResolution methods. Regards, Eric _______________________________________________ JMagick mailing list JMagick@... http://www.yeo.id.au/mailman/listinfo/jmagick |
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RE: How to do JPEG Compression Save at 10
by Bob Friesenhahn
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On Wed, 14 Sep 2005, Prasad TV wrote:
> Hi Eric, > > As you said I tried by setting quality for info object before write to file. > But when I open that new image in photo shop it allways shows saved as 12. > But I want to save the file as 10. I tried with different values for quality > between 1 to 100. There is no standard for JPEG quality values. The IJG JPEG library expects quality values between 1 to 100. So any application which depends on IJG JPEG will do the same. However, Photoshop works differently. I believe that ImageMagick does include some code for estimating the IJG JPEG quality value. This might show up in the output of 'identify -verbose'. This would be handy for determining the eqivalents to Photoshop quality values. > One more Quick Question, How do I set the DPI while saving an image? > > I have an image with 800 dpi, I want to resize to 285x431 with 72 DPI using > JMagick api. DPI is controlled via the ImageInfo 'density' or Image x_resolution and y_resolution values. Note that Photoshop does not help here either since while there is a standard for storing the resolution value in JPEG, Photoshop doesn't usually use it. Instead it stores resolution in a private profile attached to the image. Bob ====================================== Bob Friesenhahn bfriesen@..., http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ JMagick mailing list JMagick@... http://www.yeo.id.au/mailman/listinfo/jmagick |
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RE: How to do JPEG Compression Save at 10
by Jin Zhao
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> As you said I tried by setting quality for info object before write to file.
> But when I open that new image in photo shop it allways shows saved as 12. > But I want to save the file as 10. I tried with different values for quality > between 1 to 100. > I think Eric is right that jpeg compression rate is between 1-99(IJG) and can be set via ImageInfo interface in JMagick. You may try different quality values, compare different outputed images and will see the difference. Another way is using convert and identify commands to compare images with different quality values, as suggested by Bob. Photoshop seems use totally different way for quality measurement. The following link give some valuable information about jpeg compression. http://www.photo.net/learn/jpeg/ Jin _______________________________________________ JMagick mailing list JMagick@... http://www.yeo.id.au/mailman/listinfo/jmagick |
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Re: How to do JPEG Compression Save at 10
by zaske
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HI all,
To whom it may concern - I just wanted to point out that I just did quality setting and measurement. Use the "getQuality" of MagickImage. Use the "setQuality" of MagickInfo. I tried using "getQuality" of MagickImage but it returned me 0 all the time, But the combination i wrote at the top is working.
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Re: How to do JPEG Compression Save at 10
by srinivasp
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Hi zaske:
I am trying to set the quality of a png to something lower (for smaller image size). You are right "getQuality" of MagickImage returning a zero 0. Just curious if anybody actually been sucessful in setting the compression/quality. Also when I use setXResolution (90) and setYResolution(90), and resize the image, the output png's x-resoultion is 0.009 and y-resolution is 0.009. I dont know what to infer from that. Anybody help?
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Re: How to do JPEG Compression Save at 10
by Bob Friesenhahn
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On Thu, 26 Jun 2008, srinivasp wrote:
> I am trying to set the quality of a png to something lower (for smaller > image size). > You are right "getQuality" of MagickImage returning a zero 0. It used to be that this would return a value of 75 as a default. PNGs don't actually have "quality" since PNG is lossless. The quality value is used to select various parameters when the file is written. A higher quality value will usually take more CPU to write and is often smaller. > Just curious if anybody actually been sucessful in setting the > compression/quality. Also when I use setXResolution (90) and > setYResolution(90), and resize the image, the output png's x-resoultion is > 0.009 and y-resolution is 0.009. > > I dont know what to infer from that. Anybody help? The PNG units are likely millimeters rather than DPI. I would have to check the specification to be sure. The 'units' parameter determines what the values you supply represent. However, if the native units are metric, then the software has to convert to the native units. Bob ====================================== Bob Friesenhahn bfriesen@..., http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ JMagick mailing list JMagick@... http://www.yeo.id.au/mailman/listinfo/jmagick Please ensure that JMagick@... is a recipient when replying. |
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Re: How to do JPEG Compression Save at 10
by srinivasp
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Bob,
You are totally right about the units. I totally missed that part. I needed to set the setUnits as Pixels per inch. And again you are totally right about quality on PNG. Thank you. I am new to this and I am trying to put pieces together for the first time. Thank you.
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Re: How to do JPEG Compression Save at 10
by Jacob Nordfalk
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Hi,
You are using the old JMagick mailling list. We have switched to a new one some months ago. The JMagick mailing list is now at jmagick-users@.... Please post there, to make sure that all participate in the same list. To join the JMagick mailing list, please point your web brower at https://lists.sourceforge.net/lists/listinfo/jmagick-users Jacob 2008/6/27 srinivasp <spulakanam@...>:
-- Jacob Nordfalk http://javabog.dk Skype: jacobnordfalk _______________________________________________ JMagick mailing list JMagick@... http://www.yeo.id.au/mailman/listinfo/jmagick Please ensure that JMagick@... is a recipient when replying. |
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