为什么我的JPEG文件比预期的大？

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克转换+曲线 “*” 调整大小为800x800 -quality 90.0 -background白色-flatten test.jpg放在test01.jpg为什么我的JPEG文件比预期的大？

的test01.jpg文件大小为140262，但test.jpg放在文件大小为114698，我认为test01.jpg文件小于test.jpg，为什么？

gm identify -verbose test.jpg command info: 
Image: test.jpg 
    Format: JPEG (Joint Photographic Experts Group JFIF format) 
    Geometry: 960x1280 
    Class: DirectClass 
    Type: true color 
    Depth: 8 bits-per-pixel component 
    Channel Depths: 
    Red:  8 bits 
    Green: 8 bits 
    Blue:  8 bits 
    Channel Statistics: 
    Red: 
     Minimum:      0.00 (0.0000) 
     Maximum:     255.00 (1.0000) 
     Mean:      158.69 (0.6223) 
     Standard Deviation:   74.34 (0.2915) 
    Green: 
     Minimum:      0.00 (0.0000) 
     Maximum:     255.00 (1.0000) 
     Mean:      142.36 (0.5583) 
     Standard Deviation:   72.48 (0.2842) 
    Blue: 
     Minimum:      0.00 (0.0000) 
     Maximum:     255.00 (1.0000) 
     Mean:      105.80 (0.4149) 
     Standard Deviation:   73.05 (0.2865) 
    Resolution: 72x72 pixels 
    Filesize: 112.0Ki 
    Interlace: No 
    Orientation: TopLeft 
    Background Color: white 
    Border Color: #DFDFDF 
    Matte Color: #BDBDBD 
    Page geometry: 960x1280+0+0 
    Compose: Over 
    Dispose: Undefined 
    Iterations: 0 
    Compression: JPEG 
    JPEG-Quality: 64 
    JPEG-Colorspace: 2 
    JPEG-Colorspace-Name: RGB 
    JPEG-Sampling-factors: 2x2,1x1,1x1 
    Signature: ea09bde85095c8c8b2345e5301d581a8002490ecfefa63ae81c0cb14b8c2fbf8 
    Profile-iptc: 40 bytes 
    Profile-EXIF: 86 bytes 
    Orientation: 1 
    Exif Offset: 38 
    Color Space: 1 
    Exif Image Width: 960 
    Exif Image Length: 1280 
    Tainted: False 
    User Time: 0.020u 
    Elapsed Time: 0:01 
    Pixels Per Second: 39.1Mi

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