Re: [Gimp-user] Problem downsizing Tiff's
Also, because of the differences in compression types, some images that compress very well in TIFF's type of compression, compress very badly in JPG-type compression. The type of images that do this are images which have lots of very thin lines, in other words: blueprints. I don't have a good solution for saving this type of file in JPG. It really depends on why you want to re-save the file to JPG in the first place. I would like to add that JPG is supposed to be used with photographs. It's one of the least suitable formats you could use for drawings. Unnecessary big file size with unnecessary low quality. I really wonder how you could work with a quality of 40-50. You should have suffered from very bad artefacts... The best format would be a vector graphic as suggested. But from my experience it's hard to get a good one from pixel files. It might look good at one spot but on another some stuff is missing which you won't recognize from the beginning. My suggestion is to either use TIFF with compression (was already suggested) or to use PNG (or even GIF). The latter ones where designed to fit drawings. PNG is even lossless. GIF is somewhat obsolete but you might try it anyway. Typical compression rates in the files I use: uncompressed TIFF with 2-3 MB, PNG with 200-300 KB. Regards, Mathias ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Problem downsizing Tiff's
Mathias Lindner wrote: The best format would be a vector graphic as suggested. But from my experience it's hard to get a good one from pixel files. There are programs you can use that can convert (or try to convert) a bitmap image to a vector graphic one. One such option is Autotrace which you can get from SourceForge at http://autotrace.sourceforge.net/. ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Problem downsizing Tiff's
Mathias Lindner wrote: The best format would be a vector graphic as suggested. But from my experience it's hard to get a good one from pixel files. There are programs you can use that can convert (or try to convert) a bitmap image to a vector graphic one. One such option is Autotrace which you can get from SourceForge at http://autotrace.sourceforge.net/. Thanks for all the replies. It might make my situation clearer if I explain that I do not need to maintain much quality when converting these drawings, except that I need to preserve s certain level of detail so that I can read them after I import them into the application for which I am trying to downsize. Of course, the problem that I have run into this morning was that my application was choking on the tiff files, and most of the solutions I tried either did not result in smaller files, or the smaller result was so fuzzy that I could not make out certain details I need in order to work with the drawings. I did manage to crop away unnecessary areas of the original tiffs, so was finally able to import them at their full resolution into my application so that I could complete my project. Will try all the mentioned solutions to see which yields the optimum results. I'm not certain my application can work with gif's, however. Thanks again. Caruso -- Carusoswi (via gimpusers.com) ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Problem downsizing Tiff's
So, I have used Gimp to downsize large architectural drawing images from Tiff's to jpgs. Well, I always thought I was downsizing them. In the past, the process always seemed to make the files more usable in the application where I need to use the architectural drawings without a significant loss in quality. This morning, I have had trouble following 'my process'. Typically, I will open a tiff in Gimp, save as jpg, export if prompted, then select quality of 40 or 50 percent, and the result is a usable file that is significantly smaller than the source tiff file. Today, the source tiff which is 900 mb in size is being converted to jpg which is 6 or 7 mb in size, totally unusable. Additionally, if I simply open the source in Gimp, save it to another directory from Gimp without making any changes, the file also grows to 6 or 7 mb. What am I doing wrong this morning that I have not been doing wrong for the last 6 months? I am stumped (and frustrated because I have work to do). Using version 2.6.11 in Ubuntu 10.10 if that matters. I have a version of 2.7 on my Windows XP OS, and it will lock up trying to open these drawings. It's curious, because, at 900 MB, I typically can use the drawings without even altering or downsizing them. Today, it's a problem. What I really cannot understand is why Gimp is causing unaltered files to grow in size when saving them. Is that normal? Advice will be most appreciated. Caruso -- Carusoswi (via gimpusers.com) ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Problem downsizing Tiff's
On Saturday 23 April 2011 07:53:49 Carusoswi wrote: So, I have used Gimp to downsize large architectural drawing images from Tiff's to jpgs. Well, I always thought I was downsizing them. In the past, the process always seemed to make the files more usable in the application where I need to use the architectural drawings without a significant loss in quality. This morning, I have had trouble following 'my process'. Typically, I will open a tiff in Gimp, save as jpg, export if prompted, then select quality of 40 or 50 percent, and the result is a usable file that is significantly smaller than the source tiff file. Today, the source tiff which is 900 mb in size is being converted to jpg which is 6 or 7 mb in size, totally unusable. Additionally, if I simply open the source in Gimp, save it to another directory from Gimp without making any changes, the file also grows to 6 or 7 mb. What am I doing wrong this morning that I have not been doing wrong for the last 6 months? I am stumped (and frustrated because I have work to do). Using version 2.6.11 in Ubuntu 10.10 if that matters. I have a version of 2.7 on my Windows XP OS, and it will lock up trying to open these drawings. It's curious, because, at 900 MB, I typically can use the drawings without even altering or downsizing them. Today, it's a problem. What I really cannot understand is why Gimp is causing unaltered files to grow in size when saving them. Is that normal? Advice will be most appreciated. Caruso Are the architectural drawings available in a vector format such as svg or pdf? These are normally much smaller for drawings etc. than their bitmapped equivalents. If not you might have better luck importing them as bitmaps into Inkscape and then converting them to svg or pdf using either trace mode or outline mode. -- John Culleton Create Book Covers with Scribus: http://www.booklocker.com/books/4055.html ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Problem downsizing Tiff's
On Saturday 23 April 2011 07:53:49 Carusoswi wrote: So, I have used Gimp to downsize large architectural drawing images from Tiff's to jpgs. Well, I always thought I was downsizing them. In the past, the process always seemed to make the files more usable in the application where I need to use the architectural drawings without a significant loss in quality. This morning, I have had trouble following 'my process'. Typically, I will open a tiff in Gimp, save as jpg, export if prompted, then select quality of 40 or 50 percent, and the result is a usable file that is significantly smaller than the source tiff file. Today, the source tiff which is 900 mb in size is being converted to jpg which is 6 or 7 mb in size, totally unusable. Additionally, if I simply open the source in Gimp, save it to another directory from Gimp without making any changes, the file also grows to 6 or 7 mb. What am I doing wrong this morning that I have not been doing wrong for the last 6 months? I am stumped (and frustrated because I have work to do). Using version 2.6.11 in Ubuntu 10.10 if that matters. I have a version of 2.7 on my Windows XP OS, and it will lock up trying to open these drawings. It's curious, because, at 900 MB, I typically can use the drawings without even altering or downsizing them. Today, it's a problem. What I really cannot understand is why Gimp is causing unaltered files to grow in size when saving them. Is that normal? Advice will be most appreciated. Caruso Are the architectural drawings available in a vector format such as svg or pdf? These are normally much smaller for drawings etc. than their bitmapped equivalents. If not you might have better luck importing them as bitmaps into Inkscape and then converting them to svg or pdf using either trace mode or outline mode. I am generally at the whim of the entity that issues the drawings. These are only available in tiff format, but I will try your suggestion to convert them to vector format. Thanks for the reply. Any clues as to why Gimp is rendering unmodified tiffs at six times their original file size? Caruso -- Carusoswi (via gimpusers.com) ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Problem downsizing Tiff's
Carusoswi forums at gimpusers.com writes: So, I have used Gimp to downsize large architectural drawing images from Tiff's to jpgs. Let's be precise. You are not downsizing the images. Downsize means making a picture physically smaller, as in, having less pixels. According to your own description, you are not doing this. What you are doing is saving the file in another format which has better compression. Today, the source tiff which is 900 mb in size is being converted to jpg which is 6 or 7 mb in size, totally unusable. Additionally, if I simply open the source in Gimp, save it to another directory from Gimp without making any changes, the file also grows to 6 or 7 mb. Now I'm completely confused. You say the original is 900MB. then you say it grows to 6-7MB. But 900 is much larger than 6 or 7! Please explain. Did you by any chance mean 900KB and not MB? that would explain it. What I really cannot understand is why Gimp is causing unaltered files to grow in size when saving them. Is that normal? The TIFF format has many options, including several compression modes, and also an uncompressed mode. So, assuming you meant 900KB: You probably opened a compressed TIFF, and then when you saved the file, GIMP saved it as an uncompressed one. If the file has a lot of empty space - as in, a large empty area of white (or other) color - it will compress dramatically. When you re-save the TIFF, a dialog should open after you set the file name and folder. Choose LZW instead of none and see if that solves the TIFF re-saving issue. Also, because of the differences in compression types, some images that compress very well in TIFF's type of compression, compress very badly in JPG-type compression. The type of images that do this are images which have lots of very thin lines, in other words: blueprints. I don't have a good solution for saving this type of file in JPG. It really depends on why you want to re-save the file to JPG in the first place. ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Problem downsizing Tiff's
So, I have used Gimp to downsize large architectural drawing images from Tiff's to jpgs. Well, I always thought I was downsizing them. In the past, the process always seemed to make the files more usable in the application where I need to use the architectural drawings without a significant loss in quality. This morning, I have had trouble following 'my process'. Typically, I will open a tiff in Gimp, save as jpg, export if prompted, then select quality of 40 or 50 percent, and the result is a usable file that is significantly smaller than the source tiff file. Today, the source tiff which is 900 mb in size is being converted to jpg which is 6 or 7 mb in size, totally unusable. Additionally, if I simply open the source in Gimp, save it to another directory from Gimp without making any changes, the file also grows to 6 or 7 mb. What am I doing wrong this morning that I have not been doing wrong for the last 6 months? I am stumped (and frustrated because I have work to do). Using version 2.6.11 in Ubuntu 10.10 if that matters. I have a version of 2.7 on my Windows XP OS, and it will lock up trying to open these drawings. It's curious, because, at 900 MB, I typically can use the drawings without even altering or downsizing them. Today, it's a problem. What I really cannot understand is why Gimp is causing unaltered files to grow in size when saving them. Is that normal? Hi, There are tiffs and tiffs, see http://en.wikipedia.org/wiki/Tagged_Image_File_Format, however what happens if you save to png first, rather than as a tiff as defined by gimp (where some compression may have been removed). If you save to png, I would be interested in the resulting size, and then if you convert to jpg from that, what size is the jpg. Owen ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
