Some Images showed "libpng warning: Interlace handling should be turned on when using png_read_image"

[cuimingda]

I use the same code to test Image:make, some image is OK, some will display warning:

libpng warning: Interlace handling should be turned on when using png_read_image

I test for some cases:

$warningImageUrl = "https://www.bulgari.cn/media/catalog/product/cache/815b9fb227016af97d5136ae474ea5a3/3/5/355148_001_1.png";
$fineImageUrl = "https://www.vancleefarpels.cn/content/dam/rcq/vca/16/27/32/3/1627323.png";

Image::make($warningImageUrl); // output warning

Image::make($fineImageUrl); // output nothing

$image = Image::make($warningImageUrl); // output warning
$image->interlace(false);
$image->save(storage_path("test.png"));

Image::make(storage_path("test.png")); // output nothing

what is the differences between the two png images? and although there is warning, but images saved succeed.

My question is how to disable this warning?

[skylei]

https://sourceforge.net/p/libpng/bugs/165/

[cbaconnier]

I had the same warning when running my tests using libpng 1.6.34

I fixed it using GIMP by re-exporting the image to PNG and I had to uncheck Interlacing (Adam7)

More about how (not) interlacing will affect on your image on this stackexange answer

[robertoaguilar-ftf]

Contributing to @cbaconnier's solution, If you don't have access to GIMP, you can use ImageMagick.

Once installed, interlaced can be removed by running:

magick convert -interlace none path/to/source-image.png path/to/target-image.png