Image processing configuration - typo3

Question

I need help with image processing configuration in Typo3 7.6.4. All images are being processed no matter how big they are. That causes that the images are not in original size and unsharp, renamed and copied in processed folder. I would like to configure image processing so that it is activated only if images have some specific size (px or kb/mb). For example if image have more than 1MB or if the is width more than 800px, than processed it otherwise leave it as it is and link to original file (no copy, no processing). Thanks
page.10 = FLUIDTEMPLATE
page.10 {
template = CASE
template {
key.data = levelfield:-1,backend_layout_next_level,slide
key.override.field = backend_layout
1 = FILE
1.file = fileadmin/templates/sitename/main_1_column.html
2 = FILE
2.file = fileadmin/templates/sitename/main_2_column.html
}
partialRootPath = fileadmin/templates/sitename/partials/
layoutRootPath = fileadmin/templates/sitename/layouts/
variables {
siteName = TEXT
siteName.value = sitename
header < styles.content.get
header.select.where = colPos = 0
contentMain < styles.content.get
contentMain.select.where = colPos = 1
content_column_1 < styles.content.get
content_column_1.select.where = colPos = 1
content_column_2 < styles.content.get
content_column_2.select.where = colPos = 2
footer < styles.content.get
footer.select.where = colPos = 3
}
}
tt_content {
stdWrap {
innerWrap {
cObject {
default.20.40 = CASE
default.20.40 {
key.field = layout
default = TEXT
default.value = img-responsive
}
}
}
innerWrap2 >
}
image {
20 {
1 {
params.cObject = TEXT
params.cObject {
wrap = class="|"
cObject < tt_content.stdWrap.innerWrap.cObject.default.20.40
}
sourceCollection >
sourceCollection {
big {
maxW = 5000
dataKey = big
}
small {
maxW = 500
dataKey = small
}
smallLandscape {
maxW = 800
dataKey = smallLandscape
}
}
}
maxW = 5000
}
}
}