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I wish to reduce image size around 200KB before save into database. Let say I have a bitmap file around 39MB, I need to convert Bitmap to Jpeg and then reduce the Jpeg file 200KB (all type of graphics file are possible to convert (e.g bmp, jpg, png), but final graphic type will be Jpeg lesser than 200KB).
Active5 years, 2 months ago
I wish to reduce image size around 200KB before save into database. Let say I have a bitmap file around 39MB, I need to convert Bitmap to Jpeg and then reduce the Jpeg file <= 200KB (all type of graphics file are possible to convert (e.g bmp, jpg, png), but final graphic type will be Jpeg lesser than 200KB). I'm writing the following code try to convert (in this case i set the jpg quality to 10 since i want the file size to be 200KB):
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I use the same image file to convert in Adobe Lightroom program in export dialog limit the size to 200KB and compare with the image converted by the above function BMPtoJPG. The quality image from Adobe Lightroom is much more better than the function method (both file size around 200KB)
Can anyone show me how to write code reduce image size (limit size to 200KB) while the quality doesn't drop much.
Thanks and appreciate for your answer.
Compress Pdf File Less Than 200kb Online
Sherlyn ChewSherlyn Chew
2 Answers
If your goal is to have a smaller file content, you can first resize the bitmap, then apply a better
CompressionQuality
rate.As a result, the global quality of the image would probably be better.
The
Arnaud BouchezArnaud BouchezTJpegImage
relies on the standard libjpeg library, whereas I suppose that Adobe has its own tuned implementation. You can try other implementations, like the one included in GDI+, or a pure pascal implementation or even old Intel's library.38.3k33 gold badges6161 silver badges137137 bronze badges
See if your encoder support sampling. If you sample your Cb and Cr components at a lower rate than the Y component, you can often get better compression with out a lot of quality loss. If you do 4:1:1 you cut the amount of data to compress nearly by a third. 2:1:1 cuts it by half.
This technique called chroma subsampling.Unfortunately, Delphi's stock
TJpegImage
wrapper around IJG implementation ver. 6b does not expose this capability and initializes encoder context to all-default values which corresponds to 4:2:0. Refer to TJPEGImage.Compress
method code, libjpeg
documentation and jpeglib.h
or JPEGLIB.PAS
from the pasjpeg
package, if you prefer (latter is merely straightforward translation of IJG implementation ver. 6a to Pascal).Also, you can migrate to the one of other implementation. In addition to @Arnaud Bouchez list, it is worth to mention yet another Pascal implementation available to reuse: http://www.colosseumbuilders.com/sourcecode
Compress Pdf File Size Less Than 200kb
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