Inaccurate (zero) size reported for some images

[martinkrcho]

I am using perfume.js to collect information about images loaded on a website. Sometimes perfume.js reports image with 0 size - decodedBodySize, encodedBodySize and also transferSize have all value 0.

Strangely, the Network tab in the Chrome Dev Console shows correct image sizes, as expected.

I am getting similar results with lazy loading enabled and disabled.

Have you seen this behaviour somewhere else? Do you know what's causing it?

Below is the full list of images and their size as reported by perfume.js.

Size	Image URL
272359	https://my.site/wp-content/uploads/2023/08/vertopal.com_bogomil-mihaylov-i-IIU6gqHgo-unsplash-progressive-scaled.jpeg
0	https://images.rawpixel.com/image_1300/czNmcy1wcml2YXRlL3Jhd3BpeGVsX2ltYWdlcy93ZWJzaXRlX2NvbnRlbnQvbHIvZnJsYWtlX3dhdGVyX2xhbmRzY2FwZV9uYXR1cmVfMC1pbWFnZS1reWJkYzBxNS5qcGc.jpg
0	https://images.rawpixel.com/image_1300/cHJpdmF0ZS9zdGF0aWMvaW1hZ2Uvd2Vic2l0ZS8yMDIyLTA0L2xyL2ZycGF0aF90cmFpbF9hdWJyYWNfbW91bnRhaW4taW1hZ2Uta3liZDFveWYuanBn.jpg
48488	https://my.site/wp-content/uploads/2023/08/sleepy-purrito-progressive-1.jpeg.webp
0	https://images.rawpixel.com/image_1300/czNmcy1wcml2YXRlL3Jhd3BpeGVsX2ltYWdlcy93ZWJzaXRlX2NvbnRlbnQvbHIvZnJtb3VudGFpbnNfbmF0dXJhbF93b25kZXJmdWxfdmlldy1pbWFnZS1reWJkNmIwcS5qcGc.jpg
0	https://s.w.org/images/core/5.8/outside-02.jpg
0	https://s.w.org/images/core/5.8/outside-01.jpg
0	https://s.w.org/images/core/5.8/outside-03.jpg
110666	https://my.site/wp-content/uploads/2023/08/hvneoufseno.jpg.webp
62696	https://my.site/wp-content/uploads/2023/08/b3a3ryz1apk.jpg.webp
122400	https://my.site/wp-content/uploads/2023/08/niivykobcmu.jpg.webp
52344	https://my.site/wp-content/uploads/2023/08/xykvsjpqjzq.jpg.webp
0	https://pd.w.org/2022/01/84661f60659149cc8.02053291.jpg
0	https://pd.w.org/2022/01/21261f60ba46147b0.97888240.jpg
214933	https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/a019-jakubk-0393-pasta-asparagus.jpg?w=1200&h=1200&fit=clip&crop=default&dpr=1&q=75&vib=3&con=3&usm=15&cs=srgb&bg=F4F4F3&ixlib=js-2.2.1&s=7104f38452e51828c7f5c2a0d271922b
0	https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/a019-jakubk-0833-pasta-fusilli-prepared-for-cooking1.jpg?w=1200&h=1200&fit=clip&crop=default&dpr=1&q=75&vib=3&con=3&usm=15&cs=srgb&bg=F4F4F3&ixlib=js-2.2.1&s=6d8bcb2358053bd60bf1e0534bb31e14
0	https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/a019-jakubk-0406-foodiesfeed.com-pasta-photos-circles-3_low.jpg?w=1200&h=1200&fit=clip&crop=default&dpr=1&q=75&vib=3&con=3&usm=15&cs=srgb&bg=F4F4F3&ixlib=js-2.2.1&s=923b1e445174df1e101aaa5314393ee6
192641	https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/-a010-markuss-0545.jpg?w=1200&h=1200&fit=clip&crop=default&dpr=1&q=75&vib=3&con=3&usm=15&cs=srgb&bg=F4F4F3&ixlib=js-2.2.1&s=47aed21aad8fdf21db7ae586463b6373
306719	https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/a019-jakubk-0919-pasta-fusilli-prepared-for-cooking.jpg?w=1200&h=1200&fit=clip&crop=default&dpr=1&q=75&vib=3&con=3&usm=15&cs=srgb&bg=F4F4F3&ixlib=js-2.2.1&s=3777c35a83e6ac39e3505822fe2222e5
254318	https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/a019-jakubk-0875-pork-meat-with-green-vegetables.jpg?w=1200&h=1200&fit=clip&crop=default&dpr=1&q=75&vib=3&con=3&usm=15&cs=srgb&bg=F4F4F3&ixlib=js-2.2.1&s=5b12921f1ab9aea3b3fd4b63b824f08f
280162	https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/a019-jakubk-0943-pasta-tagliatelle-asparagus-tomatoes.jpg?w=1200&h=1200&fit=clip&crop=default&dpr=1&q=75&vib=3&con=3&usm=15&cs=srgb&bg=F4F4F3&ixlib=js-2.2.1&s=59f8072cca902a42d5bee6031e0795e1
147826	https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/a019-jakubk-0868-autumn-relax-with-waffle-and-coffee2.jpg?w=1200&h=1200&fit=clip&crop=default&dpr=1&q=75&vib=3&con=3&usm=15&cs=srgb&bg=F4F4F3&ixlib=js-2.2.1&s=67ab828e02cc115c6bb5e6e4c7c5af72
235220	https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/a019-jakubk-0888-pork-meat-with-green-vegetables1.jpg?w=1200&h=1200&fit=clip&crop=default&dpr=1&q=75&vib=3&con=3&usm=15&cs=srgb&bg=F4F4F3&ixlib=js-2.2.1&s=90c983931009e59c3c9aea520823c808
155887	https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/a019-jakubk-0684-bread-with-butter1.jpg?w=1200&h=1200&fit=clip&crop=default&dpr=1&q=75&vib=3&con=3&usm=15&cs=srgb&bg=F4F4F3&ixlib=js-2.2.1&s=f34e6dc09a162d26890da86377704c39
117126	https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/a010-markusspiske-oct18-033.jpg?w=1200&h=1200&fit=clip&crop=default&dpr=1&q=75&vib=3&con=3&usm=15&cs=srgb&bg=F4F4F3&ixlib=js-2.2.1&s=70487222d70c25760a26b47da2d91646
117126	https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/a010-markusspiske-oct18-033.jpg?w=1200&h=1200&fit=clip&crop=default&dpr=1&q=75&vib=3&con=3&usm=15&cs=srgb&bg=F4F4F3&ixlib=js-2.2.1&s=70487222d70c25760a26b47da2d91646
120970	https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/-a010-markuss-0159.jpg?w=1200&h=1200&fit=clip&crop=default&dpr=1&q=75&vib=3&con=3&usm=15&cs=srgb&bg=F4F4F3&ixlib=js-2.2.1&s=70ee16211abf08751df43d4ef96d2cbb
214985	https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/-a010-markuss-0308.jpg?w=1200&h=1200&fit=clip&crop=default&dpr=1&q=75&vib=3&con=3&usm=15&cs=srgb&bg=F4F4F3&ixlib=js-2.2.1&s=40111256e224ac932f446f66d9236129
147988	https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/-a010-markuss-0158.jpg?w=1200&h=1200&fit=clip&crop=default&dpr=1&q=75&vib=3&con=3&usm=15&cs=srgb&bg=F4F4F3&ixlib=js-2.2.1&s=81db7591c3f006b266037d363ff339d9
67532	https://my.site/wp-content/uploads/2023/08/8154069.jpg
189174	https://my.site/wp-content/uploads/2023/08/8mqow4dbbsg.jpg
0	https://s.w.org/patterns/files/2021/06/Mount-Fuji-From-Hakone-Hiroaki-Takahashi-scaled.jpg