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Just What is a Bitmap?
When someone says "use a jpeg bitmap", what do they mean?
Googling for how to create a jpeg bitmap says it's pretty much anything https://www.techwalla.com/articles/h...reate-a-bitmap Microsoft thinks a jpeg bitmap is something specific https://docs.microsoft.com/en-us/dot...ap-at-run-time Artists maybe create jpeg bitmaps by hand? https://magazine.art21.org/2011/09/1.../#.XAL5P9NOk4k Programmers maybe create jpeg bitmaps from text files? https://social.msdn.microsoft.com/Fo...ng-a-text-file Diehards even seem to be using hex editors to make jpeg bitmaps https://www.quora.com/How-can-I-make...g-a-hex-editor I'm not asking about bmp file format but about bitmaps in jpeg format. What is a bitmap jpeg file anyways? |
#2
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Just What is a Bitmap?
On 12/1/2018 4:18 PM, RichardLamprey wrote:
When someone says "use a jpeg bitmap", what do they mean? Googling for how to create a jpeg bitmap says it's pretty much anything https://www.techwalla.com/articles/h...reate-a-bitmap Microsoft thinks a jpeg bitmap is something specific https://docs.microsoft.com/en-us/dot...ap-at-run-time Artists maybe create jpeg bitmaps by hand? https://magazine.art21.org/2011/09/1.../#.XAL5P9NOk4k Programmers maybe create jpeg bitmaps from text files? https://social.msdn.microsoft.com/Fo...ng-a-text-file Diehards even seem to be using hex editors to make jpeg bitmaps https://www.quora.com/How-can-I-make...g-a-hex-editor I'm not asking about bmp file format but about bitmaps in jpeg format. What is a bitmap jpeg file anyways? Perhaps it would help to separate the two terms. To answer the general question, a 'bitmap' is an image comprised of squares arranged in rows and columns. JPEG is a file format that contains a version of the original bitmap image and organizes aspects of the image such as its resolution relative to the original, file size and other factors. One original purpose of the jpeg format was to allow journalist photographers to send images across the internet when 300bps modems were commonplace. -- best regards, Neil |
#3
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Just What is a Bitmap?
In article , RichardLamprey
wrote: When someone says "use a jpeg bitmap", what do they mean? they mean a jpeg image. what you mean is trolling. |
#4
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Just What is a Bitmap?
On 01/12/2018 23.45, Neil wrote:
On 12/1/2018 4:18 PM, RichardLamprey wrote: When someone says "use a jpeg bitmap", what do they mean? Googling for how to create a jpeg bitmap says it's pretty much anything https://www.techwalla.com/articles/h...reate-a-bitmap Microsoft thinks a jpeg bitmap is something specific https://docs.microsoft.com/en-us/dot...ap-at-run-time Artists maybe create jpeg bitmaps by hand? https://magazine.art21.org/2011/09/1.../#.XAL5P9NOk4k Programmers maybe create jpeg bitmaps from text files? https://social.msdn.microsoft.com/Fo...ng-a-text-file Diehards even seem to be using hex editors to make jpeg bitmaps https://www.quora.com/How-can-I-make...g-a-hex-editor I'm not asking about bmp file format but about bitmaps in jpeg format. What is a bitmap jpeg file anyways? Perhaps it would help to separate the two terms. To answer the general question, a 'bitmap' is an image comprised of squares arranged in rows and columns. JPEG is a file format that contains a version of the original bitmap image and organizes aspects of the image such as its resolution relative to the original, file size and other factors. One original purpose of the jpeg format was to allow journalist photographers to send images across the internet when 300bps modems were commonplace. I'm unsure a jpeg can be considered a format usable for bitmap manipulation, because it is a lossy format. So someone creating or changing a bitmap would not use jpeg because individual pixels can change or just be lost. A bunch of spatially contiguous pixels can be grouped and get the same value - when in the original they were different. -- Cheers, Carlos. |
#5
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Just What is a Bitmap?
In article , Carlos E.R.
wrote: I'm unsure a jpeg can be considered a format usable for bitmap manipulation, because it is a lossy format. So someone creating or changing a bitmap would not use jpeg because individual pixels can change or just be lost. A bunch of spatially contiguous pixels can be grouped and get the same value - when in the original they were different. of course it's usable. it's done every day. it's obviously preferable to use raw, but not required. |
#6
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Just What is a Bitmap?
On 12/2/2018 7:49 AM, Carlos E.R. wrote:
On 01/12/2018 23.45, Neil wrote: JPEG is a file format that contains a version of the original bitmap image and organizes aspects of the image such as its resolution relative to the original, file size and other factors. One original purpose of the jpeg format was to allow journalist photographers to send images across the internet when 300bps modems were commonplace. I'm unsure a jpeg can be considered a format usable for bitmap manipulation, because it is a lossy format. So someone creating or changing a bitmap would not use jpeg because individual pixels can change or just be lost. A bunch of spatially contiguous pixels can be grouped and get the same value - when in the original they were different. That is a different issue. There are several lossy bitmap formats, one of which is jpeg. Sometimes its lossy aspect matters, sometimes not. -- best regards, Neil |
#7
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Just What is a Bitmap?
On 02/12/2018 17.03, Neil wrote:
On 12/2/2018 7:49 AM, Carlos E.R. wrote: On 01/12/2018 23.45, Neil wrote: JPEG is a file format that contains a version of the original bitmap image and organizes aspects of the image such as its resolution relative to the original, file size and other factors. One original purpose of the jpeg format was to allow journalist photographers to send images across the internet when 300bps modems were commonplace. I'm unsure a jpeg can be considered a format usable for bitmap manipulation, because it is a lossy format. So someone creating or changing a bitmap would not use jpeg because individual pixels can change or just be lost. A bunch of spatially contiguous pixels can be grouped and get the same value - when in the original they were different. That is a different issue. There are several lossy bitmap formats, one of which is jpeg. Sometimes its lossy aspect matters, sometimes not. If you are going to do bitmaps, and expect the pixels to stay the *exact* same the next time you open the file, don't use a lossy format, because it can change your pixels... -- Cheers, Carlos. |
#8
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Just What is a Bitmap?
On 12/2/2018 5:17 PM, Carlos E.R. wrote:
On 02/12/2018 17.03, Neil wrote: On 12/2/2018 7:49 AM, Carlos E.R. wrote: On 01/12/2018 23.45, Neil wrote: JPEG is a file format that contains a version of the original bitmap image and organizes aspects of the image such as its resolution relative to the original, file size and other factors. One original purpose of the jpeg format was to allow journalist photographers to send images across the internet when 300bps modems were commonplace. I'm unsure a jpeg can be considered a format usable for bitmap manipulation, because it is a lossy format. So someone creating or changing a bitmap would not use jpeg because individual pixels can change or just be lost. A bunch of spatially contiguous pixels can be grouped and get the same value - when in the original they were different. That is a different issue. There are several lossy bitmap formats, one of which is jpeg. Sometimes its lossy aspect matters, sometimes not. If you are going to do bitmaps, and expect the pixels to stay the *exact* same the next time you open the file, don't use a lossy format, because it can change your pixels... Why are you under the impression that I disagree that jpeg is lossy, or is it that you think that's *always* the most important aspect of an image? Just curious. -- best regards, Neil |
#9
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Just What is a Bitmap?
On 03/12/2018 01.53, Neil wrote:
On 12/2/2018 5:17 PM, Carlos E.R. wrote: On 02/12/2018 17.03, Neil wrote: On 12/2/2018 7:49 AM, Carlos E.R. wrote: On 01/12/2018 23.45, Neil wrote: JPEG is a file format that contains a version of the original bitmap image and organizes aspects of the image such as its resolution relative to the original, file size and other factors. One original purpose of the jpeg format was to allow journalist photographers to send images across the internet when 300bps modems were commonplace. I'm unsure a jpeg can be considered a format usable for bitmap manipulation, because it is a lossy format. So someone creating or changing a bitmap would not use jpeg because individual pixels can change or just be lost. A bunch of spatially contiguous pixels can be grouped and get the same value - when in the original they were different. That is a different issue. There are several lossy bitmap formats, one of which is jpeg. Sometimes its lossy aspect matters, sometimes not. If you are going to do bitmaps, and expect the pixels to stay the *exact* same the next time you open the file, don't use a lossy format, because it can change your pixels... Why are you under the impression that I disagree that jpeg is lossy, or is it that you think that's *always* the most important aspect of an image? Just curious. Maybe language issue? Or cultural differences? To me a _bitmap_ has to transferred exactly, and jpeg is not valid for bitmaps. -- Cheers, Carlos. |
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