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Irfanview Save As options (Interlaced & Transparent color)
I scanned a page of preprinted Christmas stationery. The image came in
from the scanner as a jpg file. After some editing, I tried to save it, also as a jpg. A "JPEG/GIF save options" dialog popped up. I've uploaded a screen shot he https://www.dropbox.com/sh/6koey4sos2814we/yoIRm9YAqW It had two sections. The top section was entitled "JPEG:". Since that's what I was using, I assume only those options apply. Are any of these setting wrong? The bottom section was entitled "GIF:". Since I was saving as a JPEG, I assume these don't apply. But if I were, can anyone explain what the Interlaced and Transparent Color options mean and whether I should have them on or off? Thanks |
#2
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Irfanview Save As options (Interlaced & Transparent color)
In article , Jennifer
Murphy wrote: I scanned a page of preprinted Christmas stationery. The image came in from the scanner as a jpg file. After some editing, I tried to save it, also as a jpg. A "JPEG/GIF save options" dialog popped up. I've uploaded a screen shot he https://www.dropbox.com/sh/6koey4sos2814we/yoIRm9YAqW It had two sections. The top section was entitled "JPEG:". Since that's what I was using, I assume only those options apply. Are any of these setting wrong? there is no right or wrong, it depends what you want to do. for photos that have exif/iptc/xmp etc, you would likely want to preserve that information, but a scanned image doesn't have that so in this case, it doesn't matter. if you also edit photos then you probably will want to preserve that. don't bother with progressive jpegs and it's almost guaranteed you do not want a greyscale image, so leave those off. you could disable chroma subsampling for the highest quality, but it's not anything humans will be able to see so there's no point. if you really wanted the highest quality you'd not be using jpeg. does your scanner software let you safe as tiff or png? jpeg is lossy and scanning is a pain, so it's best to use a non-lossy format from the scanner, such as tiff, then convert it to jpeg later. that does take up more space than jpeg, but disk space is cheap. The bottom section was entitled "GIF:". Since I was saving as a JPEG, I assume these don't apply. the bottom section applies to gif only, and the top section only to jpeg. But if I were, can anyone explain what the Interlaced and Transparent Color options mean and whether I should have them on or off? interlaced draws every other line so you see *something* quickly and then it goes back and fills in the rest. this was useful when people were stuck with slow modems so they would see a low quality version in half the time and then they could wait for the full image if they wanted (or just close the page if they didn't care). with broadband being ubiquitous, there is no need to bother with that anymore. gifs are tiny anyway and they appear instantly and weren't all that slow on modems anyway. transparent colour is for using a gif on a web page or other image, where an area can be transparent so other graphic elements can be seen behind the gif. whatever colour you pick as transparent becomes 'clear' so you won't see a rectangular block if it doesn't match the page background. |
#3
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Irfanview Save As options (Interlaced & Transparent color)
On Sat, 28 Dec 2013 11:25:58 -0800, Jennifer Murphy
wrote: I scanned a page of preprinted Christmas stationery. The image came in from the scanner as a jpg file. After some editing, I tried to save it, also as a jpg. A "JPEG/GIF save options" dialog popped up. I've uploaded a screen shot he https://www.dropbox.com/sh/6koey4sos2814we/yoIRm9YAqW It had two sections. The top section was entitled "JPEG:". Since that's what I was using, I assume only those options apply. Are any of these setting wrong? The bottom section was entitled "GIF:". Since I was saving as a JPEG, I assume these don't apply. But if I were, can anyone explain what the Interlaced and Transparent Color options mean and whether I should have them on or off? Yes, the top is for JPGs only. Just accept the defaults -- except you could save with a lower quality (which gives smaller files and makes them easier to email). You probably won't notice the diff between 100% and 80% (or even 60%). If you intend to do more editing involving multiple saves, then certainly save at 100% - or better, work with TIFs, which are not lossy. Use JPGs for photos, GIFs for graphics (images with few distinct colors). The settings don't matter much for GIFs. You only need transparency if you are combining the GIF with another image. W |
#4
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Irfanview Save As options (Interlaced & Transparent color)
On Sat, 28 Dec 2013 15:10:14 -0500, nospam
wrote: In article , Jennifer Murphy wrote: I scanned a page of preprinted Christmas stationery. The image came in from the scanner as a jpg file. After some editing, I tried to save it, also as a jpg. A "JPEG/GIF save options" dialog popped up. I've uploaded a screen shot he https://www.dropbox.com/sh/6koey4sos2814we/yoIRm9YAqW It had two sections. The top section was entitled "JPEG:". Since that's what I was using, I assume only those options apply. Are any of these setting wrong? there is no right or wrong, it depends what you want to do. for photos that have exif/iptc/xmp etc, you would likely want to preserve that information, but a scanned image doesn't have that so in this case, it doesn't matter. if you also edit photos then you probably will want to preserve that. don't bother with progressive jpegs and it's almost guaranteed you do not want a greyscale image, so leave those off. you could disable chroma subsampling for the highest quality, but it's not anything humans will be able to see so there's no point. if you really wanted the highest quality you'd not be using jpeg. does your scanner software let you safe as tiff or png? jpeg is lossy and scanning is a pain, so it's best to use a non-lossy format from the scanner, such as tiff, then convert it to jpeg later. that does take up more space than jpeg, but disk space is cheap. The bottom section was entitled "GIF:". Since I was saving as a JPEG, I assume these don't apply. the bottom section applies to gif only, and the top section only to jpeg. But if I were, can anyone explain what the Interlaced and Transparent Color options mean and whether I should have them on or off? interlaced draws every other line so you see *something* quickly and then it goes back and fills in the rest. this was useful when people were stuck with slow modems so they would see a low quality version in half the time and then they could wait for the full image if they wanted (or just close the page if they didn't care). with broadband being ubiquitous, there is no need to bother with that anymore. gifs are tiny anyway and they appear instantly and weren't all that slow on modems anyway. transparent colour is for using a gif on a web page or other image, where an area can be transparent so other graphic elements can be seen behind the gif. whatever colour you pick as transparent becomes 'clear' so you won't see a rectangular block if it doesn't match the page background. Thanks, very helpful. |
#5
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Irfanview Save As options (Interlaced & Transparent color)
On Sat, 28 Dec 2013 14:46:40 -0700, Wally wrote:
On Sat, 28 Dec 2013 11:25:58 -0800, Jennifer Murphy wrote: I scanned a page of preprinted Christmas stationery. The image came in from the scanner as a jpg file. After some editing, I tried to save it, also as a jpg. A "JPEG/GIF save options" dialog popped up. I've uploaded a screen shot he https://www.dropbox.com/sh/6koey4sos2814we/yoIRm9YAqW It had two sections. The top section was entitled "JPEG:". Since that's what I was using, I assume only those options apply. Are any of these setting wrong? The bottom section was entitled "GIF:". Since I was saving as a JPEG, I assume these don't apply. But if I were, can anyone explain what the Interlaced and Transparent Color options mean and whether I should have them on or off? Yes, the top is for JPGs only. Just accept the defaults -- except you could save with a lower quality (which gives smaller files and makes them easier to email). You probably won't notice the diff between 100% and 80% (or even 60%). If you intend to do more editing involving multiple saves, then certainly save at 100% - or better, work with TIFs, which are not lossy. Use JPGs for photos, GIFs for graphics (images with few distinct colors). The settings don't matter much for GIFs. You only need transparency if you are combining the GIF with another image. W Thanks, very helpful. |
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