Images in the DBF binary note fields (Blob), what is a compressed binary data-CodePudding

Image compression before:

After the image compression:

Images in DBF binary note fields (Blob), what is a compressed binary data. A master can tell me what general DELPHI compression algorithm is used to save space?

CodePudding user response:

There are many types of images compression way,
Directly convert JPG, PNG format, such as compressed format, the format you again compression also has no meaning,

Another is compressed using ZipLib library, Delphi itself have packaging good, can be called directly,
Don't write code, there are many examples, it is good to oneself baidu,

And of course use other ways, such as: call the rar API can also achieve compression,
The key see you use occasions!

CodePudding user response:

Generally each data has different optimal compression method,

CodePudding user response:

reference 1st floor SmallHand response:

there are many types of images compression way,
Directly convert JPG, PNG format, such as compressed format, the format you again compression also has no meaning,

Another is compressed using ZipLib library, Delphi itself have packaging good, can be called directly,
Don't write code, there are many examples, it is good to oneself baidu,

And of course use other ways, such as: call the rar API can also achieve compression,
The key see you use occasions!

Should not turn JPG, because, the program shows or BMP format,

CodePudding user response:

refer to the second floor lhylhy response:

each data generally have different optimal compression method,

Database is DBASE,

CodePudding user response:

reference 4 floor seagull2 response:

Quote: refer to the second floor lhylhy response:

Each data generally have different optimal compression method,

Database is DBASE,

What is the purpose of you, it is to decrypt, or to compress storage, want to know the reason, or application need?

CodePudding user response:

reference 5 floor SmallHand reply:

Quote: refer to 4th floor seagull2 response:

Quote: refer to the second floor lhylhy response:

Each data generally have different optimal compression method,

Database is DBASE,

What is the purpose of you, it is to decrypt, or to compress storage, want to know the reason, or application need?

Be decrypted,
Software is able to run, however, weaves, with DELPHI software images can export, but I want to use other language reading DBF in software database, but DBF field database is the binary images, I read binary data with other applications, but is not the image data, I estimate the software for binary field compression, image if is 9 k, 3 k database Rio,

I don't know are there any similar compression algorithm in the DELPHI, after know algorithm, I want to reverse decompression,

CodePudding user response:

I put the image data upload to baidu network location: http://pan.baidu.com/share/link? Shareid=415208 & amp; UK=503584255
If you can, I can pay a bit fee,

CodePudding user response:

If it is a figure with RLE compression ratio will be very high,
BMP - & gt; JPG is lossy compression

CodePudding user response:

refer to the eighth floor qiankunbobo response:

if is a figure with RLE compression ratio will be very high,
BMP - & gt; JPG is lossy compression

Certainly not turn JPG, that is not a JPG file header,

CodePudding user response:

refer to 7th floor seagull2 response:

I put the image data upload to baidu network location: http://pan.baidu.com/share/link? Shareid=415208 & amp; UK=503584255
If you can, I can pay a bit fee,

I have an idea, you first try
1. What do you use rar or zip to compress images into a variety of formats,
2. Then use your compressed format and format of the file in your database to carry on the contrast, with contrast tools faster (Beyond Compare)
3. So you can target, if not compression, it would need to decipher, is more troublesome, do you want to know compression can also be counted as one of encryption method,

CodePudding user response:

references to the tenth floor SmallHand response:

Quote: refer to 7th floor seagull2 response:

I put the image data upload to baidu network location: http://pan.baidu.com/share/link? Shareid=415208 & amp; UK=503584255
If you can, I can pay a bit fee,

I have an idea, you first try
1. What do you use rar or zip to compress images into a variety of formats,
2. Then use your compressed format and format of the file in your database to carry on the contrast, with contrast tools faster (Beyond Compare)
3. So you can target, if not compression, it would need to decipher, is more troublesome, do you want to know compression can also be counted as one of encryption method,

Winrar compression, file can see out,

CodePudding user response:

11 references seagull2 response:

Quote: reference to the tenth floor SmallHand response:

Quote: refer to 7th floor seagull2 response:

I put the image data upload to baidu network location: http://pan.baidu.com/share/link? Shareid=415208 & amp; UK=503584255
If you can, I can pay a bit fee,

I have an idea, you first try
1. What do you use rar or zip to compress images into a variety of formats,
2. Then use your compressed format and format of the file in your database to carry on the contrast, with contrast tools faster (Beyond Compare)
3. So you can target, if not compression, it would need to decipher, is more troublesome, do you want to know compression can also be counted as one of encryption method,

Winrar compression, file can you see out,

You don't understand what I mean, I mean with rar compressed into a variety of formats, and matching,
For example, you compress into rar, zip or other format,
Also, which are frequently used Delphi is a method of compressed stream compression, you write a demo, and then see results after compression,
The source of many online, get it myself,

CodePudding user response:

refer to 12 floor SmallHand reply:

Quote: reference 11 floor seagull2 response:

The
Quote: reference to the tenth floor SmallHand response:

Quote: refer to 7th floor seagull2 response:

I put the image data upload to baidu network location: http://pan.baidu.com/share/link? Shareid=415208 & amp; UK=503584255
If you can, I can pay a bit fee,

I have an idea, you first try
1. What do you use rar or zip to compress images into a variety of formats,
2. Then use your compressed format and format of the file in your database to carry on the contrast, with contrast tools faster (Beyond Compare)
3. So you can target, if not compression, it would need to decipher, is more troublesome, do you want to know compression can also be counted as one of encryption method,

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