How to Update bfSize in resize?

Question

In resize problem, we have to update the headers of image. Which attributes should be updated and how do i update bfSize attribute?

I think it should be something like: bf.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + bi_new.biSize; — Dusan Milosevic, Commented Jun 27, 2014 at 17:42
What kind of error do you get, because I think I have similar problem, and I can't figure it out. — Dusan Milosevic, Commented Jun 27, 2014 at 17:43
I'm not getting error in code. I reszie the image and it does. But when i check50 program it fails all the checks. That's why i thought something is wrong with my header — HKH, Commented Jun 27, 2014 at 19:07

supeindesu · Accepted Answer · 2014-06-27 18:44:02Z

12

You have to update all the attributes that have to change after a resize: bi.biWidth, bi.biHeight, padding, bi.biSizeImage & bf.bfSize.

bf.bfSize = (updated bi.biSizeImage) + 54

answered Jun 27, 2014 at 18:44

supeindesu

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and bi.biSizeImage?
– HKH
Commented Jun 29, 2014 at 15:35
updated bi.biSizeImage = ((updated bi.biWidth) * sizeof(RGBTRIPLE) + (updated padding)) * absolute value of (updated bi.biHeight);
– supeindesu
Commented Jun 29, 2014 at 15:57
Thank you very much!. It really solved my problem.
– HKH
Commented Jun 29, 2014 at 16:14
You're welcome.
– supeindesu
Commented Jun 29, 2014 at 16:42
1

for updating bi.biSizeImage, why do we need to time size of RGBTRIPLE?
– Florence Wu
Commented Feb 25, 2015 at 6:44

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