Different Bytes Count of QImage

[beecksche]

Hi,
Does anybody understand the size in bytes of the QImage?

QImage image128(128, 128, QImage::Format_Grayscale8);
image128.sizeInBytes(); // == 16384, which is 128*128  

QImage image102(102, 102, QImage::Format_Grayscale8);
image102.sizeInBytes(); // == 10608, which is NOT 102*102, but 102*104 ?!?

Thanks

[ollarch]

Hi,

Because of 4 byte alignment (32 bit alignment):
"The width and height must be specified in pixels, data must be 32-bit aligned, and each scanline of data in the image must also be 32-bit aligned"