in this page i’ve tested an already compressed image against the original png tested here

Source Image: {{originalImage.filename}}

compress {{originalImage.compression}} palette {{originalImage.channels}} folder_zip {{originalImage.filesize}}

aspect_ratio {{originalImage.width}} x {{originalImage.height}}

warning SSIM {{originalImage.ssim.all}} – PSNR {{originalImage.psnr.all}}

Reference Image: {{ referenceImage.filename }}

compress {{referenceImage.compression}} palette {{referenceImage.channels}} folder_zip {{referenceImage.filesize}}

aspect_ratio {{referenceImage.width}} x {{referenceImage.height}}

VS

Target SSIM Similarity Name Size Time to encode
{{image.similarity}} {{ extendedFormatName(image) }} {{ getFileSize(image.sizebyte) }} {{image.encodetime}}

sort={{currentSort}}, dir={{currentSortDir}}, page={{currentPage}}
{{currentCompare.left}} vs {{currentCompare.right}}

SIZE

TIME

QUALITY

Charts 4 geeks

Filesize

Time – total encoding time

SSIM – Structural Similarity Index

DSSIM – Structural Dissimilarity Index

PSNR – peak signal to noise ratio

MAE – Mean Absolute Error (normalized), average channel error distance